Create Account; Log Out ; Log In ; Wishlist 0; Shopping Cart 0; Home; About It was in the last few issues of SAR. The mil actually only specs M4 feed ramps for use in its M4s. 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. Konza Defender M-LOK 5.56 16" Rifle 1x7 FEATURES: 16" 4150 Nitride 1x7 5.56 Barrel T-Marked Upper with M4 Feed Ramps Steel Micro Gas Block, and Carbine Length Gas Tube 15" 7075 T6 Aluminum Free Float M-LOK Hand Guard A2 Muzzle Break BCG is an M16 Style Nitride QPQ Finish Charging Handle Mil-Spec 6 Position Mil-Spec Diameter Stock Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. I have seen it done many, MANY times and if done right, it works/functions 100% without issue. And that is the important thing! There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. They . When carrying out feed ramp polishing, it is crucial to prioritize the frame's angles, which is a critical part of the feed ramp. 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. Some gun owners believe that the M4 ramps can help for some of the larger-diameter cartridges in use. Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. If this is your first visit, be sure to The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. Ready to drop onto a complete lower receiver. The parts are interchangeable. On AR9's, I understand the distance between the Mag Follower and the Feed Ramp is a known complication in the design. We want you, our readers, to be able to make informed decisions. You are using an out of date browser. Im an old vet, now retired and looking to build some ARs as a hobby to keep me doing something that I will enjoy. The best case is to have both an upper and barrel that have the feed ramps. M4 Feed ramps on barrel extensions are a solid example. The barrel blanks available are made from 416 Stainless Steel. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? 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. M4 feed ramps will extend the barrel extension and the upper receiver. Would not feed to save its life! 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. are all barrels w/ m4 feed ramps?? I built the upper using a Mega upper with a Compass Lake 18" barrel. i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. Is it kosher to add M4 feed ramps to a standard upper to match an m4 ramped barrel? It is milled out of 6061 T6. 30 cal. The A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. I like all my guns to be reliable. If you ever have an issue, then look at getting a correct barrel for the upper. The closest brand new barrel you are likely to find is the Windham Weaponry 20 inch 1/7 twist chrome lined barrel. Feed ramps on barrel extensions are a good example. They were not intended to be super long range man killers. An upper without feed ramps can be used with a barrel that has them as the majority of the ramp is on the barrel extension. By my estimates, the tip of the bullet first hits the barrel extension about 1/3 of the way up the respective feed ramp on the barrel extension. It's best to use rifle/rifle combo or M4/M4. well.. it's kinda hard to get stuff in this part of the world. However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. If your mag catch is at Spec height, you should not have a problem with an M4 cut barrel in a rifle 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. 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 . Again, youll find plenty of videos on spooling up hand grinders to remedy feed ramp and ejection port issues with these larger cartridges, but I strongly suggest going factory-done aftermarket. America's Ultimate Shooting Sports Discounter, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window). Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. Watch a video about our Modern Series AR barrel: 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). Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. And it appears that the bolt is slamming into the top of the bullet. The difference between standard feed ramps and M4 ramps is easy to see. 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. Is one better than the other? Copyright 2016 - 2023 by AdventureFootstep.com. It's best to use rifle/rifle combo or M4/M4. Modern Series Barrels. Home Firearms Figuring Out Feed Ramps. If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. He had more to say and added some more engineer and gun designer speak too. again, Thanks. Man, its crazy how many of yall have absolutely no idea why you do what you do. Issues can arise when receivers and barrel extensions are mismatched. M4 Feed ramps on barrel extensions are a solid example. Went back to the sellers website and found I was not the only one with problems. The barrel extension and the receiver both have to have the cuts. Barrel, sight and trigger work on most pistols and shotguns. Not saying a really good gunsmith cant do it, just that theres a bit of an involved process. I put together a second AR9 that is having a feeding issue, even if using similar parts as the first one. Read Now. Thats true overall and good to keep in mind. 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. M4 can better explain their benefit, although they help with more reliable feeding. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. With the increased use of larger-diameter cased cartridges, the M4 feed ramps are proving their values when using them in those cartridges. Single Action and Double Action Which One Is Better For You? This space is for pictures of "retro" Stoner rifles and completed or partial retro AR-15 builds, as well as discussions about either. Just because you can, doesn't mean you should. can the barrel extension be bought individualy? Change the angle so that the ramp ends at the exact same point. pm me at BOG or PG, or get in touch with my number 09177542777 if you're interested. 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. Reliability is the main concern for me when I re-barrel this rifle. You need to match up barrels to receivers for optimum performance. 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. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. 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 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. I'm a machinist in the aerospace industry and lucky enough to have. I am having a tough time finding an in-stock barrel (18 or 20 incher) with a rifle extension on it. Thread: Adding M4 feedramps to A1/C7 upper. If I can correct an issue before it's an issue that is preferred. Go back to writing school. Thanks! Avoid Polishing Too Lightly Or Too Roughly All Rights Reserved. if you are OK with 3MOA, you might go 20,000 rounds! Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! Experts advise on 31 degrees+30 minus-zip. I should have taken my own advice for once. By 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? I got my help from this thread, and thank you again to ORD. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . Full M4 feed ramps start on the upper and continue onto the barrel extension. 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. It may not display this or other websites correctly. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. After two months of back and forth, cleaned up the feed ramps. This Kit is made to cut or polish the STEEL Feed Ramps on your Barrel Extension ONLY. "C" stamp and CAGE code available. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. Try this little exercise: 1. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. 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. As suggested, its best to match the upper and barrel extension no worries that way. 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. 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. Semi autos run slower than full autos. Rifles, Uppers, Lowers, Barrels, and more, [ARCHIVED THREAD] - Rifle vs m4 feed ramps, http://i135.photobucket.com/albums/q125/PursuitSS/Postings%20photos/c0d26170b75c3e6f9ea65a7d0862247e.jpg. 2. 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. By Yamil Sued August 6, 2021. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. 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.