This Kit is made to cut or polish the STEEL Feed Ramps on your Barrel Extension ONLY. Semi autos run slower than full autos. what I fear the most is having an m4 ramp upper and then getting a barrel with a rifle ramp. In short, if you have a Dremmel you can do it yourself. Those ramps line up with the barrel, which are cut deeper than on a rifle barrel. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. Remember less is more, little by little. Will my A3 upper reciever work with my M4 barrel extention.According to some or your posts they will.Thanks Bill. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. A forum community dedicated to drag racing drivers and enthusiasts. 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. This is one time it's better to go a little too far than to leave an edge for the . 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. Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. When you need to nail something you use a hammer not a wrench. Home Firearms Figuring Out Feed Ramps. Amazing what happens in a thread over a simple question. So, I had purchased a 458 upper. M16s and M16-A1s run at 750 rounds per minute in full auto. 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. Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. Your link has been automatically embedded. In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. Can I use a barrel with M4 feed ramps with an upper that isnt M4 matched? I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. Product Details Douglas 18" Flat Dark Earth Cerakoted 416 stainless steel barrel with 1-7 twist and M4 feed ramps. It gives a longer ramp that is less steep into the chamber. UPPER RECEIVER: AR-15 Mil-Spec Machined out of 7075-T6 Forged Aluminum, M4 Feed Ramps, Cerakoted Magpul Flat Dark Earth (FDE) Color with Forward Assist and Ejection Port Cover Installed BARREL: 22 inch, 223 Wylde Caliber, 4150 CMV, 1:7 Twist, Heavy Bull Barrel Profile, Straight Fluted, Melonite/Nitride Finish - made for us by Tactical Kinetics HAND My alternative plan is to do exactly as you describe. Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. 1 is a standard and the other for use with m4 feed ramp barrels. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. again, Thanks. . Feeds flawlessly. Recommend using a gunsmith this route too if you are not comfortable. Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. Check often for fit. are all barrels w/ m4 feed ramps?? Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? so it is better to have an upper reciever that's designed for non-m4 feed ramps since you can put in standard barrels right? In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. All Rights Reserved. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. A feed ramp is a basic feature of many breech loading cartridge firearm designs. It's best to have M4 ramps on both the upper and barrel. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. I didnt think anything about it having M4 feed ramps. Finding the proper upper receiver is your best option. I wont buy a barrel that isnt a wylde 223 556 but Im only now noticing. M4 Feed ramps on barrel extensions are a solid example. 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. 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. The tip of the cartridge rarely comes into contact with the upper receiver. Try this little exercise: 1. i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. 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. 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? Upload or insert images from URL. I'm a machinist in the aerospace industry and lucky enough to have. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. Then the manufacturer discontinued the barrel. 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. So, what is the difference between M4 feed ramps and regular ones? Full M4 feed ramps are on both the upper and barrel extension. And that is the important thing! 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. By if you are OK with 3MOA, you might go 20,000 rounds! Create Account; Log Out ; Log In ; Wishlist 0; Shopping Cart 0; Home; About 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. 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). 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. which is basicallly an m16a1 cut down. Just put it in and shoot it. Thats true overall and good to keep in mind. All Rights Reserved. EDIT: Okay, I understand now! A closer look at uppers and barrel extensions. Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) Required fields are marked *. That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. I just need a little guidance on this and I'm having trouble getting good results from Google. 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. Powered by Invision Community. 410 stainless is also harder and more corrosion resistant than conventional 416 stainless found in other commercially available precision barrels. Copyright 1996-2023 AR15.COM LLC. Not all mil-spec features advertised on the product information are the real mil-specs. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. Editors Note: This article was originally published in January of 2019. The Shooter's Log, is to provide informationnot opinionsto our customers and the shooting community. I like getting another Upper idea then you could end up with two rifles! Interesting reading. 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). 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. Ready to drop onto a complete lower receiver. But, as with anything else, this work can go too far. Most work performed while-you-wait, evening and saturday appointments available. If I have a rifle ramp upper and get the barrel later and coincidentally will have an m4 ramp. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. The Fora platform includes forum software by XenForo. All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. BrianEnos.com I'm assuming that you only need the ramps from one or the other. . The magazine lips cannot move, so with these larger diameter cartridges, the bullet tips down lower about the centerline of the bore (half of the diameter increase to be exact). He had more to say and added some more engineer and gun designer speak too. 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. Ideally both. You can post now and register later. Read Now. Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. I can probably get the upper reciever first. Looking for a black stripped A1 upper with non m4 feed ramps (just realized the upper I have wont work with my barrel). They . FN AR15 barrels are hammer forged using the same proprietary high-grade Chrome Moly Vanadium steel used in FN's venerable machinegun barrels produced to handle the punishment of . Moreover, telling someone that an extension can be modified, while not a lie, is nothing more than mental masturbation when your post contains a caveat for having the knowledge and proper tools. i have the rifle barrel. Instead, I just loaded up each mag with two rounds, and pushed the rounds forward by hand until the tip of . The only other time it seems to help is if the mag is feeding the rounds with the bullet slightly angled lower than normal. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. 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 Polishing the edges of the chamber mouth to remove the edges of that chamfer will. Some argue that, factually, its a step to enable a smoother feeding. Do you have an AR barrel or feed ramp tip? On AR9's, I understand the distance between the Mag Follower and the Feed Ramp is a known complication in the design. I built the upper using a Mega upper with a Compass Lake 18" barrel. Only took a few minutes. 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. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. 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. With the increased use of larger-diameter cased cartridges, the M4 feed ramps are proving their values when using them in those cartridges. A couple of times I ended up with the OK set up from the picture above. Theres a bit more to it than just polishing. The information provided here does not represent the views of Cheaper Than Dirt! Copyright 2016 - 2023 by AdventureFootstep.com. I picked up a side charging upper from Sundevil last year. Shopping with us is absolutely safe - you never have to worry about credit card safety when shopping here Share your latest AR build or photos from the range with #RangeDayFriday for a chance to win a new firearm! this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. If it's happening regularly, check the magazines you are using for serviceability. Caught a deal on a matched barrel and bolt. The A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. Your previous content has been restored. I had seen these pix years ago and dismissed the idea of mix and match. All Rights Reserved. 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. what does it do?? Also, barrel life is relative. Some gun owners believe that the M4 ramps can help for some of the larger-diameter cartridges in use. I will attest that a rifle upper and a barrel with the M4 feedramps works just fine. You wrote that much to make a point that should have taken about 100 words? 308 m5 using m4 feed ramps, which I belive are for the smaller round like. If your mag catch is at Spec height, you should not have a problem with an M4 cut barrel in a rifle receiver. There is a picture of the various options, hopefully another poster can link them. is the m4 feedramp common in barrel extensions? There's a 7 degree difference between standard and M4 ramps. 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.