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They offer a lower, more extensive, and smoother entry for any round of ammo, whether its necessary or not. By Yamil Sued August 6, 2021. Then you can get a regular rifle barrel for the upper with no ramps. All Rights Reserved. Do you have an AR barrel or feed ramp tip? 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. from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. Lol. Will my A3 upper reciever work with my M4 barrel extention.According to some or your posts they will.Thanks Bill. Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? Is it kosher to add M4 feed ramps to a standard upper to match an m4 ramped barrel? Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. A couple of times I ended up with the OK set up from the picture above. if you are OK with 3MOA, you might go 20,000 rounds! Press J to jump to the feed. I read in Bravo company that there are 2 kinds of flat top upper. You wrote that much to make a point that should have taken about 100 words? This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. If you want precision, dont look to the mil-spec gun, look to the one that is popular in 3-gun competitions, at Thunder Ranch, etc. I would just make sure to order rifle upper with rifle barrel extension or M4 upper with M4 barrel extension. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. You absolutely do not want it the other way around however. Use this M4 Barrel extention with M4 feedramps. 3. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. 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. Is one better than the other? It's an interesting question. Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. The first reason is that they are, indeed, better. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. 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. All we do is dremmel it to match - we dont remove it and grind to any specific angle. These units actually feature the NON-F-Marked (correct) front sight base. Go back to writing school. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. With a larger diameter case body sitting down in the magazine, the tip of the bullet sits lower in relation to the chamber/bore centerline than with a .223-size round. Go slow and you'll be done in no time. Those ramps line up with the barrel, which are cut deeper than on a rifle barrel. Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. 30 cal. Most work performed while-you-wait, evening and saturday appointments available. 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? #2. Either way is good and both types work great with semi auto only guns. Brevity matters. You want them to match. Insert the barrel and sharpie the cut area, then use the right bit on a dremel. Only took a few minutes. Read Now. What's the difference? For new construction barrels only. I replaced the M4 feed ramp barrel with a monolithic feed ramp barrel and no more problems. I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. May 17, 2008 in The Armorer. If it's happening regularly, check the magazines you are using for serviceability. 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). Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. April 23, 2014 in Rifle - Technical. ago Costs about $40-50 to have the feed ramps reprofiled from what I can gather. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . 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. pm me at BOG or PG, or get in touch with my number 09177542777 if you're interested. So I called. Recommend using a gunsmith this route too if you are not comfortable. I don't have much to add re: feed ramps, but. I have a non ramped barrel in a ramped upper, feeds fine. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! By the time you made it work you spent more time, money, and effort than if you just bought a new barrel or upper. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. BUT if you find someone to grind your feed ramps and they do a good job, post it up and let us know. You need to match up barrels to receivers for optimum performance. Copyright 1996-2023 AR15.COM LLC. If your mag catch is at Spec height, you should not have a problem with an M4 cut barrel in a rifle receiver. However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. 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. Issues can arise when receivers and barrel extensions are mismatched. So the engineers lowered the feed rampa into the receiver. Supposedly you'll only notice issues with rapid/auto fire with a configuration like this. *Must have a registered ARFCOM account to win. The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. 3. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? ago KrinkyDink2 9 hr. Thread: Adding M4 feedramps to A1/C7 upper. "A Bad Day At The Range Is Better Than A Great Day Working". Little polish. BUT, I DO NOT TRUST MY LIFE TO THAT WEAPON. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. Feed ramps on barrel extensions are a good example. I use it for hunting dogs only. can the barrel extension be bought individualy? The Fora platform includes forum software by XenForo. I've seen uppers with and without anodizing on M4 ramps . it seems to me to be about 50/50 with and without. M4 ramps help in feeding in for carbine in full auto. I can assure you that most mods that deviate from the original design aren't 100% reliable. One new winner* is announced every week! The ramps are in the barrel extension. The only other time it seems to help is if the mag is feeding the rounds with the bullet slightly angled lower than normal. Mil-spec is good for the masses, and if you want the job done it is a great start. M4 can better explain their benefit, although they help with more reliable feeding. Just because you can, doesn't mean you should. A4 Complete Upper Receiver. I picked up a side charging upper from Sundevil last year. 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. 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. A feed ramp is a basic feature of many breech loading cartridge firearm designs. They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. 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. Earlfillmore 13 hr. The photo shows the dents and the bolt lugs line up perfectly. 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. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. Experts advise on 31 degrees+30 minus-zip. The rifle-platform M16s dont use them. Jams and misfires. No need to alter the upper. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. Please allow 5~10 days for assembly and testing before ship date. I had seen these pix years ago and dismissed the idea of mix and match. 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. Machined from 4150 Chrome Moly Vanadium Steel and feature a QPQ corrosion resistant finish and QPQ coated M4 feed ramp extension. 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! I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. 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. The ramps on the regular rifle-type extension are cut just to the edge of the extension. Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. DSA has fat top, Mueller, non feed ramp uppers for $40. True, which is why they're not even needed in semi autos. You have the option of barrel type, thread, fluting, finish type and to add a match bolt. 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 Either way is good and both types work great with semi auto only guns. Powered by Invision Community. Feels like a silly question now that it makes sense. I've seen several places say you just need a 1/8" chainsaw sharpening bit and a Dremel to fix it. 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. 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. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. 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. The A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. You also repeated yourself. It is milled out of 6061 T6. Thats true overall and good to keep in mind. Any use of this content without express written consent is prohibited. Previous. The mil actually only specs M4 feed ramps for use in its M4s. Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. 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. Not saying a really good gunsmith cant do it, just that theres a bit of an involved process. 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. Share it in the comments section. 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. 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. Required fields are marked *. 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 .
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