adding m4 feed ramps to barreladding m4 feed ramps to barrel

$101.95. By So, lets glide down these lines below to erase your misconceptions about them. I will attest that a rifle upper and a barrel with the M4 feedramps works just fine. They guide the bullet up and into the chamber. Metal cases ammunition such as Wolf through an M4 clone? Don't forget read more information about it here! I've thought about it myself, and I'd like to see test results if any exist, displaying what reliability effect M4 ramps have on other barrel lengths. There's no downside to having M4 feedramps on your carbine, but they are not as necessary without full auto and when using followers that will not tilt (or in a 20 AR15). I'm planning on replacing my forearm with a Larue 13.5. All Rights Reserved. M16's fed pretty well before the M4 feed ramps were introduced. It is removeable with a special wrench and a barrel clamp/vise. check out the. What is the difference between Modern, Performance, and Premium Series Barrels? The first reason is that they are, indeed, better. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. I've seen several places say you just need a 1/8" chainsaw sharpening bit and a Dremel to fix it. well.. it's kinda hard to get stuff in this part of the world. #2. What's the difference? 410 stainless is also harder and more corrosion resistant than conventional 416 stainless found in other commercially available precision barrels. Editors Note: This article was originally published in January of 2019. M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. Forged 7075-T6 aluminum is harder than a bulls balls. I notice that's a Gibbz (or Gibbz-type) upper. Recommend using a gunsmith this route too if you are not comfortable. Reddit and its partners use cookies and similar technologies to provide you with a better experience. You also repeated yourself. hey bro nice to see you here!!! You need to match up barrels to receivers for optimum performance. BEFORE YOU GO MODIFYING IT, check your headspace.I have a Gibbz upper in my junk drawer because the upper -- for some reason -- wouldn't allow a perfectly good bolt (as checked by Criterion) to headspace correctly on a Criterion barrel, with the bolt installed in the carrier. You have the option of barrel type, thread, fluting, finish type and to add a match bolt. 308 m5 using m4 feed ramps, which I belive are for the smaller round like. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. A feed ramp is a basic feature of many breech loading cartridge firearm designs. You absolutely do not want it the other way around however. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. When you need to nail something you use a hammer not a wrench. If you ever have an issue, then look at getting a correct barrel for the upper. Then you can get a regular rifle barrel for the upper with no ramps. Thats an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. Please be respectful of others. I'd get jams from bullets hitting the back of the upper so I took a small round file and made the M4 ramps in the upper. With the increased use of larger-diameter cased cartridges, the M4 feed ramps are proving their values when using them in those cartridges. So the engineers lowered the feed rampa into the receiver. The photo shows the dents and the bolt lugs line up perfectly. However, an M4 barrel extension is dished more so the feed ramps could extend downward, and then an area within the upper is shaped to match. Some barrels I see for sale say they include M4 feed ramps, and some uppers say they include them too. So, an M4 feed ramp includes the barrel extension and the upper. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. The upper I want to rebarrel is modified for Service Rifle competition so it's not quite as cheap as buying another $89 upper from Aero. It's near impossible to replace the carry handle upper I have these days, and finding a colt chrome lined 20" light weight barrel isn't a walk in the park either. It's not worth changing the barrel extension on an already finished barrel, getting the new barrel extension to line up correctly with the gas port will probably cost more in gunsmithing/machining fees than buying a new barrel. Thats true overall and good to keep in mind. Now move move the on deck cartridge forward to the 3/8 of inch position and again note the position of the tip of the bullet in relationship to the barrel extension. Barrel, sight and trigger work on most pistols and shotguns. This is a big tip, by the way, for pistol-caliber ARs. I checked what I have now. If I can correct an issue before it's an issue that is preferred. Feels like a silly question now that it makes sense. A forum community dedicated to drag racing drivers and enthusiasts. . So like ORD says it is entirely 100% possible and plenty of people do it, but I would rather not do any work to this perfect barrel. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. Copyright 1996-2023 AR15.COM LLC. i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. and add them to non-m4 barrels.? For instance I was looking at the BCM upper receiver, and it said it had M4 feed ramps machined into the upper. This has been my concern with modifying the aluminum parts. Jams and misfires. "A Bad Day At The Range Is Better Than A Great Day Working". Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? Ar-15 Manufacturers Should Be Avoided: Which Should You Buy? It's an interesting question. You can put a M4 barrel and non-M4 receiver together, but you can't mismatch them the other way. The angle is going to be key, alot of people attempt to mimic the angle of the barrel feed ramps, this is incorrect. Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. I can still use the combination. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. I replaced the M4 feed ramp barrel with a monolithic feed ramp barrel and no more problems. The M4 was the first (allegedy) carbine length gas system. For a better experience, please enable JavaScript in your browser before proceeding. BUT if you find someone to grind your feed ramps and they do a good job, post it up and let us know. "It will last 5k rounds instead of 4k. Guess what? No need to alter the upper. Powered by Invision Community, M4-style barrel extension with Rifle-type upper. Inadequate knowledge about these feed ramps can lead to lots of problems with barrels because they are essential parts to guide the bullet up and into the chamber. Some suggest taking a grinder to the extension area. BUT, I DO NOT TRUST MY LIFE TO THAT WEAPON. Supposedly you'll only notice issues with rapid/auto fire with a configuration like this. You can post now and register later. You will be able to leave a comment after signing in, AR15Armory.com We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. On the other hand, I wouldn't consider them as a deal breaker, and they would not pass up a good deal with an upper only because it did not have them - the M4 feed ramps. Caught a deal on a matched barrel and bolt. what does it do?? I have done the same, protect the Barrel extension with a layer of electrical tape and carefully file or Dremel the ramps into the aluminum receiver. Upper Receiver, A4, Flat Top, USGI, Numbered, AR-Stoner Upper Receiver Stripped AR-15 A3 Flat-Top Matte, Black River Tactical 16 Cold Hammer Forged Optimum Barrel Accuracy Evaluation. Please allow 5~10 days for assembly and testing before ship date. I too built a .458 SOCOM carbine . pictures would help. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. 5. Good call. One of the AR15 engineers under Gene Stoner pretty much said that the M4 isn't a good platform, especially once the gas port erodes a bit. Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. Seems M4 is all the rage these days. The closest brand new barrel you are likely to find is the Windham Weaponry 20 inch 1/7 twist chrome lined barrel. However Ive built numerous ar15 and lr308 rifles and pistols. M4 M-4 Feed Ramp Jam with 55 gr grain Bullets, Solution, Fix, AR15 AR-15 Stuck Cartridge iowaunemployment 21K views 10 years ago Comparing AR15 barrels -Faxon vs. Bear Creek arsenal-. Full M4 feed ramps are on both the upper and barrel extension. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. Our 6.5 Grendel Black Nitride rifle barrels are made from the finest 4150 Chrome Moly Vanadium and precisely rifled for high accuracy at a great price. We have four combinations here: So there's a lot more going on with rounds bouncing up and down in the mags etc. Is one better than the other? It's not worth changing the barrel extension on an already finished barrel, getting the new barrel extension to line up correctly with the gas port will probably cost more in gunsmithing/machining fees than buying a new barrel. It was in the last few issues of SAR. For those who have actually done it will a new barrel with the M4 feed ramp extension function properly with an old school rifle-type upper receiver? First of Im not a gunsmith or firearms professional. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. M16s and M16-A1s run at 750 rounds per minute in full auto. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. This is one time it's better to go a little too far than to leave an edge for the . Either way is good and both types work great with semi auto only guns. - The Shooter's Log, 2012 SHOT Show Special Report: Del-Ton TRX Rifle and More! By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Experts advise on 31 degrees+30 minus-zip. . 's blog. I built the upper using a Mega upper with a Compass Lake 18" barrel. Try this little exercise: 1. Most of barrel assemblies and upper receivers on the market now have a present of M4 feed ramps. I've shot a good deal of rounds through 20" A2's and I realize they run but you are describing issues that the M4 feed ramps alleviate, that would probably be good to reduce on A2's as well. Full M4 feed ramps start on the upper and continue onto the barrel extension. Ideally both. Only took a few minutes. Backing up a ton: Any and all AR-15 barrel extensions have feed ramps. For new construction barrels only. Amazing what happens in a thread over a simple question. The rifle-platform M16s dont use them. I'd get jams from bullets hitting the back of the upper so I took a small round file and made the M4 ramps in the upper. In this episode of Gun Stock Reviews, we look at the difference between M4 Ramps and the old standard ramps of the past. I think your mistaking that with adding ramps to the receiver. I like getting another Upper idea then you could end up with two rifles! I got my help from this thread, and thank you again to ORD. If you have an account, sign in now to post with your account. I have a non ramped barrel in a ramped upper, feeds fine. A closer look at uppers and barrel extensions. Theres a bit more to it than just polishing. I'm a machinist in the aerospace industry and lucky enough to have unrestricted access to a really nice machine shop so the modification from rifle to M4 feed ramps is no sweat, I've done it once before a few years back with a .250" carbide cutter in the mill for a friend and it came out looking indistinguishable from a true M4 extension. It's going to a gunsmith to be shortened and rethreaded anyways, can they just grind/polish the feed ramps to match or is it more involved than that? The manufacturer said they had sold hundreds of barrels with out problems reported. I wont buy a barrel that isnt a wylde 223 556 but Im only now noticing. While I've got everything apart, I'm thinking I just want to put an M4 barrel extension on. Thread: Adding M4 feedramps to A1/C7 upper. It is a tightly machined and polished piece of metal which guides a cartridge from the top of the magazine into the firing chamber of the barrel. So, what youre saying is that an M16 upper (not M4 cut) will work with either barrel, but an M4 cut upper will only work with an M4 cut barrel. The M4 Style Feed ramps And Barrel Extension Provide Consistent Feeding And The Matte Black Manganese Phosphate Finish resists External Corrosion And OxidationLength: 14.70"Model: AR-15Finish: Manganese PhosphateBarrel Type: Carbine LengthBarrel Features: Chrome-LinedManufacturer: FN Mfg Number: 20-100405Model: AR-15 . Is it kosher to add M4 feed ramps to a standard upper to match an m4 ramped barrel? You must log in or register to reply here. I think my question would be why rifle receiver+M4 barrel is just "ok" rather than "good", unless the point is that in a carbine-gas gun M4 ramps are just considered an improvement over no ramps. The ramps on the regular rifle-type extension are cut just to the edge of the extension. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. Some argue that, factually, its a step to enable a smoother feeding. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. M4A1s run at 950 rounds per minute in full auto and even 950+ rounds per minute as the gas port erodes open bigger and bigger with wear and allows them to run even faster and much more violent. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. We're a little past that point as I already own both the barrel and receiver, both of which cant easily be replaced or swapped for a decent price. In short, if you have a Dremmel you can do it yourself. To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. Home Firearms Figuring Out Feed Ramps. Installing a Luth-AR Rifle Buffer Tube and an A2 Stock #1041. So, what is the difference between M4 feed ramps and regular ones? From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. The best case is to have both an upper and barrel that have the feed ramps. Modern Series Barrels. This space is for pictures of "retro" Stoner rifles and completed or partial retro AR-15 builds, as well as discussions about either. Bullets tend to bump, snag, and stub on these guns. Polishing the edges of the chamber mouth to remove the edges of that chamfer will. All Rights Reserved. M4 Feed ramps on barrel extensions are a solid example. All NFA rules apply. Having been in military supply, I know that what the mil-spec means: it gets the minimum job done for thousands (millions) of parts/systems. Brevity matters. Married pretty well with my Seekins machined lower. These units actually feature the NON-F-Marked (correct) front sight base. Bear Creek Arsenal Barrels - 6.5 Grendel Type 2 Barrel This Gorilla Machining AR-15 16" heavy Black Nitride 6.5 Grendel barrel has a Carbine length gas system with a 1:8 twist. By Yamil Sued August 6, 2021. You CAN modify a rifle/A2 barrel extension to an M4 style extension, but it isn't always the best way to go unless you just have to do it. Issues can arise when receivers and barrel extensions are mismatched. is the m4 feedramp common in barrel extensions? Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. If your magazines are set up correctly, and the feed lip edges polished smooth, each round fed from the magazine will go directly into the chamber. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps 16" Pre-Ban M4 Profile Barrel Assembly CARBINE Gas System About Upper assembly comes completely head spaced and test fired. Barrel customizations are also available. Thanks. If this is your first visit, be sure to There are several, but Steve and the guys at ADCO in OH are one such option (they use the Dremel method, but they do it right as I have seen several first-hand examples of their work and its performance after the fact). This 20" BCM barrel is machined from SS410 stainless steel. M4 barrel to non M4 receiver is fine, but not the other way around. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. So I'm working on my first build, and I'm a little confused. Ready to drop onto a complete lower receiver. I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. what I fear the most is having an m4 ramp upper and then getting a barrel with a rifle ramp. Since the M4 barrel is one and a half inches shorter than the minimum legal barrel you can install in an AR15, the M4 gas tube will be, of course, smaller. 2. The M4 cut extends down beyond the edge of the barrel extension (has a scalloped appearance), and a correspondingly deeper cut in an M4-spec upper receiver effectively extends the ramps downward (theyre lowered). Only took a few minutes. You need to match up barrels to receivers for optimum performance. 3. All comments are held for moderation and will appear after approval. Reliability is the main concern for me when I re-barrel this rifle. One new winner* is announced every week! They offer a lower, more extensive, and smoother entry for any round of ammo, whether its necessary or not. The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. Man, its crazy how many of yall have absolutely no idea why you do what you do. You can run M4 cut barrels with rifle receivers, but not the other way around as it will create at catch that can hang up the bullets. A shorter gas tube means reduced gas pressure, and we all know what happens when there isn't enough pressure to cycle the bolt carrier group properly. Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. Sorta. The trust part is accepting claims of USGI-spec parts actually being done to not only blueprint dimensions, but also made from the correct materials treated to the same processes. M4 Barrel Extension (M4 Feedramps) $22.95 (4 reviews) SKU: Barrel-Extension-M4 Stock Status: Quantity: Add to Wish List Description For your AR15, M16, M4. Is it worth the extra 50 bucks?" Gas block area is .750 diameter. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? Notify me of follow-up comments by email. Being a Newbie AR owner ((Ive been an avid gun owner for nearly 50 years), I appreciate the information and visual aids that Im sure will be a big help in enjoying and using this gun platform. The barrel Throat is the second most critical component after angles and should be polished with utmost care. They . Most work performed while-you-wait, evening and saturday appointments available. I have seen it done many, MANY times and if done right, it works/functions 100% without issue. Any use of this content without express written consent is prohibited. Single Action and Double Action Which One Is Better For You? Would not feed to save its life! An older-version (or A2-style) feed ramp is cut only on the barrel extension itself (top). Will my A3 upper reciever work with my M4 barrel extention.According to some or your posts they will.Thanks Bill. Previous. Powered by Invision Community. Sent back again. Regular feed ramps are cuts into the barrel extension only, which allows guiding the round into the chamber during loading, making them a fundamental feature of many breech-loading firearm designs. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. However, I have seen more than a few basement gunsmith hackjobs using a dremel, some Jack Daniels/liquid courage, and an unsteady hand that have made a total, unrepairable mess of the job. Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. I wouldn't be concerned at all with any wear after modifying an upper receiver. Looking for a black stripped A1 upper with non m4 feed ramps (just realized the upper I have wont work with my barrel). can you buy feed ramps individually? Press question mark to learn the rest of the keyboard shortcuts. instead of mil-spec. Create an account to follow your favorite communities and start taking part in conversations. Another reason is that any commercial receiver and parts makers want to tool up to make upper receivers and barrel extensions, especially when shorter guns are becoming more popular. Its a miracle! In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. ago Costs about $40-50 to have the feed ramps reprofiled from what I can gather. Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. 3. And that is the important thing! AR9 - Help diagnosing feeding issue. Now, theres nothing wrong at all with a little polish on any and all feed ramps, which can not only be done fairly easily, it can be successfully done by most at home. Just put it in and shoot it. Load a magazine with two or three rounds, lock the bolt group back on your rifle or carbine and insert the magazine. I should have taken my own advice for once. But, as with anything else, this work can go too far. Its fine to use an M4 Barrel with a non-N4 (rifle) upper but if you have the barrel already is much simpler to just buy a M-4 upper and just replace the upper the barrel is harder to build..I have even cut ramps on a rifle upper and it really wasent needed That is before I knew better.Then I guncoted the ramps before I found out about Aluminum Black treatment. *Must have a registered ARFCOM account to win. If you don't clean it but demand 3/4MOA you might get 1,500. Interesting reading. if you are OK with 3MOA, you might go 20,000 rounds! SKU: BCM-URG-M4-16 Features: M4 Feed Ramp Barrel Extension Caliber: 5.56 NATO Barrel Length: 16in Barrel Style: Standard Handguard: None BCM M4 Handguards (Double Heat Shield) - Black + $15.00 PKMR (Polymer KeyMod Rail) Carbine Length - Black + $24.95 PKMR (Polymer KeyMod Rail) Carbine Length - Flat Dark Earth + $24.95 Stock Status: Out of stock My factory JP CTR-02 has the appearance of the bottom right picture in the post above, M4 barrel extension in a rifle receiver, and there is not a mark on the aluminum under the barrel extension. Description. It is milled out of 6061 T6. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. Somwhere in the 1990s I believe, Colt designed the M4 feed ramps, where they took some of the material out of the upper receiver, cut two little ramps in it and then cut the ramps in the barrel extention a little further forward. In most cases the ramps only help during full auto mode while cycling at a high rate. M4 can better explain their benefit, although they help with more reliable feeding. M4 Feed ramps on barrel extensions are a solid example. By the time you made it work you spent more time, money, and effort than if you just bought a new barrel or upper. Edited April 27, 2014 by Mark Gale However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. For this test, I used a Colt upper with M4 feed ramps and a SOCOM heavy 14.5 barrel, just like what is used in the military. Full M4 feed ramps start on the upper and continue onto the barrel extension. All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. Not all mil-spec features advertised on the product information are the real mil-specs. I will check with compass lake. Went back to the sellers website and found I was not the only one with problems. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. I don't quite trust myself to give it a go, but if that's all there is to it I'm hoping they can do it for a reasonable price. CARBON-15 Stripped Lower Receiver May 17, 2008 in The Armorer. You cannot paste images directly. Buy AR 15 16" .350 Legend Nitride M4 Profile Barrel 1:16: GunBroker is the largest seller of AR15 Parts Gun Parts All: 974000728 . You are using an out of date browser. On AR9's, I understand the distance between the Mag Follower and the Feed Ramp is a known complication in the design. Anodized red parts. However, if youre wanting to rebarrel a non-M4-cut upper with an M4 feed-ramp equipped barrel, or going the other direction: you have a new upper thats been relieved to fit with the M4 ramps, and a non-M4-cut barrel extension, and that wont work! are all barrels w/ m4 feed ramps?? The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. If your mag catch is at Spec height, you should not have a problem with an M4 cut barrel in a rifle receiver. I like all my guns to be reliable. I didnt think anything about it having M4 feed ramps. Featuring hand lapped 1/8 twist rate button rifling and M4 feed ramps barrel extensions, the 410 stainless barrel gives the shooter the best balance of weight and accuracy. Can someone recommend or point me in the right direction of a good quality upper receiver for an SPR build that does not have M4 feed ramp cuts in it? M4 ramps help in feeding in for carbine in full auto. Pasted as rich text. M4 feed ramps. . Press question mark to learn the rest of the keyboard shortcuts. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? i have the rifle barrel. FN AR-15 5.56X45mm Nato . Using an upper with M4 feed ramps with a barrel that does not have them will lead to feed problems as it creates a ledge/lip that can catch the bullet tip as it tries to feed. The Shooter's Log, is to provide informationnot opinionsto our customers and the shooting community. There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. Change the angle so that the ramp ends at the exact same point. It's best to use rifle/rifle combo or M4/M4. You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. Finding the proper upper receiver is your best option. It gives a longer ramp that is less steep into the chamber. When carrying out feed ramp polishing, it is crucial to prioritize the frame's angles, which is a critical part of the feed ramp. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. DSA has fat top, Mueller, non feed ramp uppers for $40. Avoid Polishing Too Lightly Or Too Roughly While this gun is a more of novelty build than a "serious use" AR, I intend to use good parts and want it to run as well as my other ARs. In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver.

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