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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-. 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). You want them to match. 50 bucks one way or the other on the barrel ain't squat! The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. 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. Please allow 5~10 days for assembly and testing before ship date. I can still use the combination. However, its rare now to find an upper receiver or a ready-to-go barrel that doesnt have the M4 cuts. The barrel Throat is the second most critical component after angles and should be polished with utmost care. You also repeated yourself. If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. The rifle-platform M16s dont use them. 30 cal. I'm assuming that you only need the ramps from one or the other. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. As suggested, its best to match the upper and barrel extension no worries that way. However Ive built numerous ar15 and lr308 rifles and pistols. Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. The best case is to have both an upper and barrel that have the feed ramps. This is why you can use a barrel with an extension with M4 feedramps with a receiver that does not have feedramps, but you cannot use a receiver with M4 feedramps with a barrel with an extension with rifle feedramps. Ok, So, in short, I've got a barrel on my Armalite upper (with M4 feed ramps in the upper) that has standard AR-15 (non-M4) ramps. I read in Bravo company that there are 2 kinds of flat top upper. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. Everything that you have on your side to make any weapons more reliable and work when it absolutely needs to is a plus. 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 A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. If it was some flat top + 16" FSB barrel id just swap upper/barrel, but this is a little more challenging to do that with. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Just because you can, doesn't mean you should. I'm planning on replacing my forearm with a Larue 13.5. 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. I should have taken my own advice for once. 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. On AR9's, I understand the distance between the Mag Follower and the Feed Ramp is a known complication in the design. hey bro nice to see you here!!! This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. BUT, I DO NOT TRUST MY LIFE TO THAT WEAPON. I suggest you get a rifle receiver. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! Machined from 4150 Chrome Moly Vanadium Steel and feature a QPQ corrosion resistant finish and QPQ coated M4 feed ramp extension. Its a miracle! pm me at BOG or PG, or get in touch with my number 09177542777 if you're interested. 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 Some suggest taking a grinder to the extension area. Issues can arise when receivers and barrel extensions are mismatched. The barrel extension and the receiver both have to have the cuts. A couple of times I ended up with the OK set up from the picture above. So there's a lot more going on with rounds bouncing up and down in the mags etc. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. We have four combinations here: It's best to have M4 ramps on both the upper and barrel. In short, if you have a Dremmel you can do it yourself. 2. Clear editor. I will check with compass lake. Description. Here's some info from Randall Rauch aka www.ar15barrels.com, if your barrel extension has M4 ramps you should have an upper receiver also with the ramps. The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. and add them to non-m4 barrels.? 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. I'm a machinist in the aerospace industry and lucky enough to have. 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. After two months of back and forth, cleaned up the feed ramps. check out the. i have the rifle barrel. 3. And it appears that the bolt is slamming into the top of the bullet. 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. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. Ar-15 Manufacturers Should Be Avoided: Which Should You Buy? Other selections are available for upper, bolt and carrier, charging handle, handguards, flash hiders, and gas blocks. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. 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. 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. This has been my concern with modifying the aluminum parts. I've seen uppers with and without anodizing on M4 ramps . it seems to me to be about 50/50 with and without. The information provided here does not represent the views of Cheaper Than Dirt! The first reason is that they are, indeed, better. Barrel customizations are also available. I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. If this is your first visit, be sure to M16's fed pretty well before the M4 feed ramps were introduced. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. can you buy feed ramps individually? M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces Editors Note: This article was originally published in January of 2019. All things being equal and having used both weapons extensively, Id rather have the feed Ramps. 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. I think your mistaking that with adding ramps to the receiver. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. Looking For Bear Creek Arsenal Barrels Review? If you aren't 110% comfortable with doing the job, and you do not have all the tools and equipment to do it properly, then have a smith do it for you. 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. So, an M4 feed ramp includes the barrel extension and the upper. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. Guess what? For a better experience, please enable JavaScript in your browser before proceeding. All comments are held for moderation and will appear after approval. AR Tech Tip - Checking M4 Ramps for overhang School of the American Rifle 84.8K subscribers Subscribe 2.9K 90K views 2 years ago AR Tech Tip - Checking M4 Ramps for overhang Show more Show more. A4 Complete Upper Receiver. April 23, 2014 in Rifle - Technical. Theres a bit more to it than just polishing. It may not display this or other websites correctly. Don't forget read more information about it here! I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. 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. The mil actually only specs M4 feed ramps for use in its M4s. M4 barrel to non M4 receiver is fine, but not the other way around. M16s and M16-A1s run at 750 rounds per minute in full auto. practical_man Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. You will be able to leave a comment after signing in, AR15Armory.com Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. Watch a video about our Modern Series AR barrel: Use this M4 Barrel extention with M4 feedramps. You can put a M4 barrel and non-M4 receiver together, but you can't mismatch them the other way. This 20" BCM barrel is machined from SS410 stainless steel. 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. Lol. 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. Is one better than the other? So I'm working on my first build, and I'm a little confused. CARBON-15 Stripped Lower Receiver Thank you for answering the question do well. The difference between standard feed ramps and M4 ramps is easy to see. 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 . This can lead to a rare but odd situation; barrel and receiver mismatch. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. Married pretty well with my Seekins machined lower. Dec 17, 2020. The barrels also had to be modified. FN AR-15 5.56X45mm Nato . if you are OK with 3MOA, you might go 20,000 rounds! Some barrels I see for sale say they include M4 feed ramps, and some uppers say they include them too. Instead, I just loaded up each mag with two rounds, and pushed the rounds forward by hand until the tip of . M4 feed ramps are not an original design, they were designed for the M4 In fact, the . I got my help from this thread, and thank you again to ORD. Given that most of us dont always have perfect access to truly genuine Mil-Spec, mil-standard parts (those actually used in issued fighting tools), were shopping based on a little part trust and a bigger part knowledge. I will attest that a rifle upper and a barrel with the M4 feedramps works just fine. Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. So, I had purchased a 458 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. Display as a link instead, Please be respectful of others. The M-16/M4 are great weapons. It gives a longer ramp that is less steep into the chamber. 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? I don't have much to add re: feed ramps, but. May 17, 2008 in The Armorer. 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. For use by barrel manufacturers. So, what is the difference between M4 feed ramps and regular ones? Edited April 27, 2014 by Mark Gale BrianEnos.com 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. Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. 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. Installing a Luth-AR Rifle Buffer Tube and an A2 Stock #1041. . Should not be too hard. Some gun owners believe that the M4 ramps can help for some of the larger-diameter cartridges in use. ago KrinkyDink2 9 hr. Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. I'd rather not spent the money to get it cut to the specific length I need, FSB installed, etc just to have it immediately not work and have to sort out then or start from square one with a new barrel. If I have a rifle ramp upper and get the barrel later and coincidentally will have an m4 ramp. 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. Some argue that, factually, its a step to enable a smoother feeding. It's an interesting question. 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). Experts advise on 31 degrees+30 minus-zip. Shorter length equates to much higher pressure in the upper receiver. Add M4 cuts to Barrel Ext $15.00 We can modify your rifle extension to match the M4 cuts in an upper receiver. If you ever have an issue, then look at getting a correct barrel for the upper. 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. If a barrel comes with the feed ramps could I take them off? can the barrel extension be bought individualy? Load a magazine with two or three rounds, lock the bolt group back on your rifle or carbine and insert the magazine. Thanks! I replaced the M4 feed ramp barrel with a monolithic feed ramp barrel and no more problems. All Rights Reserved. My alternative plan is to do exactly as you describe. So the engineers lowered the feed rampa into the receiver. Was sort of worried about how it would run with an 11.5" barrel and mismatched ramps, but it sounds like it should be good to go either way. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps I have seen it done many, MANY times and if done right, it works/functions 100% without issue. 16" Pre-Ban M4 Profile Barrel Assembly CARBINE Gas System About Upper assembly comes completely head spaced and test fired. 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. So, an M4 feed ramp includes the barrel extension and the upper. That puts the cartridge in a position where the extended feed ramp improves the breech-loading design. Avoid Polishing Too Lightly Or Too Roughly I can assure you that most mods that deviate from the original design aren't 100% reliable. well.. it's kinda hard to get stuff in this part of the world. Product Description Surplus Colt 14.5" SOCOM, carbine length gas system barrel from Colt. Just put it in and shoot it. Barrel, sight and trigger work on most pistols and shotguns. Proper maintenance and lubrication. what does it do?? Go slow and you'll be done in no time. Reddit and its partners use cookies and similar technologies to provide you with a better experience. 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. "C" stamp and CAGE code available. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Semi autos run slower than full autos. I didn't forsee that we'd ever see the day when replacement parts would be so hard to get. I like getting another Upper idea then you could end up with two rifles! For instance I was looking at the BCM upper receiver, and it said it had M4 feed ramps machined into the upper. Personally, I would sell the rifle upper and buy an M4 upper - the cost will be small and you will end up with a more satisfactory end product. For the purposes of this chapter, we'll call the new one the M4, and the old one the AR. from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. EDIT: Okay, I understand now! For a better experience, please enable JavaScript in your browser before proceeding. Thanks. By Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? All NFA rules apply. 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. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. Change the angle so that the ramp ends at the exact same point. instead of mil-spec. ago Costs about $40-50 to have the feed ramps reprofiled from what I can gather. It is milled out of 6061 T6. Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). You can post now and register later. 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. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. You have a rifle barrel. Notify me of follow-up comments by email. which is bad combo. I am glad to know that I need to look for changes in design and the differences in the A2 and A4 feed ramp / rails. With the increased use of larger-diameter cased cartridges, the M4 feed ramps are proving their values when using them in those cartridges. 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. You wrote that much to make a point that should have taken about 100 words? JavaScript is disabled. Reach in through the ejection port and slide the on deck cartridge about 1/4 inch forward and observe the tip of the bullet in relationship to the barrel extension. A feed ramp is a basic feature of many breech loading cartridge firearm designs. again, Thanks. Man, its crazy how many of yall have absolutely no idea why you do what you do. I notice that's a Gibbz (or Gibbz-type) upper. 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. Get The Best Trigger Pull Gauges To Make Every Shot Count. M4 feed ramps. 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.