They guide the bullet up and into the chamber. When I function tested it the first time with live half-jacketed rounds I had the worst FTF jam I have ever experienced. My experience with ARs is all A-1s. Machined from 4150 Chrome Moly Vanadium Steel and feature a QPQ corrosion resistant finish and QPQ coated M4 feed ramp extension. Share it in the comments section. Don't forget read more information about it here! Press question mark to learn the rest of the keyboard shortcuts. The extension is the part at the end of the barrel that fits inside the upper. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. However, they do have M4 feed-ramps which is not clone correct. Lol. 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. A couple of times I ended up with the OK set up from the picture above. 50 bucks one way or the other on the barrel ain't squat! Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . By So, an M4 feed ramp includes the barrel extension and the upper. 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. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. Went back to the sellers website and found I was not the only one with problems. The only other time it seems to help is if the mag is feeding the rounds with the bullet slightly angled lower than normal. First of Im not a gunsmith or firearms professional. The Mission of Cheaper Than Dirt! Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. Good call. I got my help from this thread, and thank you again to ORD. That puts the cartridge in a position where the extended feed ramp improves the breech-loading design. 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. And it appears that the bolt is slamming into the top of the bullet. I notice that's a Gibbz (or Gibbz-type) upper. Some, me included, have said that the M4 ramps are a help to some of the larger-diameter cartridges in use, such as 6.5 Grendel or .22 Nosler. Either way is good and both types work great with semi auto only guns. Go slow and you'll be done in no time. which is basicallly an m16a1 cut down. First, the M4 barrel and non-M4 upper isnt likely to cause issues, but due to the relief cut on an M4-spec upper, there will be a gap that works like an edge that most definitely can snag the bullet and stub the round. Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) Thats an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. BUT if you find someone to grind your feed ramps and they do a good job, post it up and let us know. 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. One new winner* is announced every week! They . check out the. This has been my concern with modifying the aluminum parts. Ready to drop onto a complete lower receiver. The angle is going to be key, alot of people attempt to mimic the angle of the barrel feed ramps, this is incorrect. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. If you have a m4 ramped upper but not barrel you can cause problems as there's a lip of steel barrel extension in the way that can cause feeding problems. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps Then the manufacturer discontinued the barrel. Feed ramps on barrel extensions are a good example. 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. M16's fed pretty well before the M4 feed ramps were introduced. Its not a big deal but still an important thing to remember and understand. You need to match up barrels to receivers for optimum performance. The A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. Issues can arise when receivers and barrel extensions are mismatched. The M-16/M4 are great weapons. Editors Note: This article was originally published in January of 2019. Semi autos run slower than full autos. By Yamil Sued August 6, 2021. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. 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. FN AR-15 5.56X45mm Nato . Is one better than the other? Ideally both. The tip of the cartridge rarely comes into contact with the upper receiver. i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. By using the M4 feed ramps for your firearm, you could pick up an increased percentage of the rounds, and feeding reliability would be improved. The parts are interchangeable. With the increased use of larger-diameter cased cartridges, the M4 feed ramps are proving their values when using them in those cartridges. 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? Everything that you have on your side to make any weapons more reliable and work when it absolutely needs to is a plus. You want them to match. from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. Anodized red parts. - The Shooter's Log, 2012 SHOT Show Special Report: Daniel Defense DDM4 V5 in .300 Blackout and a Factory SBR - The Shooter's Log, 2012 SHOT Show Special Report: SOG Armory Predator Rifle - The Shooter's Log, Surefire's 100-Round MAG5-100: The Highest Capacity AR-15 Magazine - The Shooter's Log, Throwback Thursday: Taurus Judge Range Report, ATI Milsport SGA 410 All the Advantages of an AR in .410, Ruger SR1911 LW Commander The Lightweight .45 ACP, Rifle Hack: Sighting for 100 Yards at a Distance of 25 Yards, Throwback Thursday: All About Bullet Grain. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. April 23, 2014 in Rifle - Technical. Required fields are marked *. Finding the proper upper receiver is your best option. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. You can always buy a non-m4 extension and have the new barrel retimed and headspaced, but it will probably cost more than a new upper receiver. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Backing up a ton: Any and all AR-15 barrel extensions have feed ramps. The leading cause that leads to the development of the M4 feed ramp is the gas pressure from the carbine gas system that is increasing along with a high cyclic rate. M16s and M16-A1s run at 750 rounds per minute in full auto. The information provided here does not represent the views of Cheaper Than Dirt! AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. If you have an account, sign in now to post with your account. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. All comments are held for moderation and will appear after approval. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. Olympic Arms Upper receiver with rear sight assembly and forward assist and dust cover has M4 feed ramps $260 View attachment 1016575 View attachment 1016576 By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. 5. and add them to non-m4 barrels.? By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. You absolutely do not want it the other way around however. 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 (they're lowered). You also repeated yourself. Product Details Douglas 18" Flat Dark Earth Cerakoted 416 stainless steel barrel with 1-7 twist and M4 feed ramps. 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 Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. what does it do?? Any use of this content without express written consent is prohibited. Previous. CARBON-15 Stripped Lower Receiver I've modified barrel/receivers even before M4 cuts came out and done some receivers when the barrels had cuts. Powered by Invision Community. 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. Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. Create Account; Log Out ; Log In ; Wishlist 0; Shopping Cart 0; Home; About 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. Read Now. FWIW one of my rifles has M4 feed ramps on the barrel and no M4 feed ramps on the upper and it has functioned just fine. 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. "It will last 5k rounds instead of 4k. ago KrinkyDink2 9 hr. 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. However, its rare now to find an upper receiver or a ready-to-go barrel that doesnt have the M4 cuts. 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. M4 feed ramps will extend the barrel extension and the upper receiver. 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. 1 is a standard and the other for use with m4 feed ramp barrels. This is one time it's better to go a little too far than to leave an edge for the .