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Posted: 5/20/2005 10:25:15 AM EDT
I know this subject is beat to death, some say M4 cuts make little or no difference, others say it's sometimes critical for reliable feeding with certain projectiles.

The question: How many have personally had, or personally seen a situation where M4 feedramps meant the difference between reliable feeding an not?

Please share as this decision is killing me on my build.

Link Posted: 5/20/2005 10:25:49 AM EDT
Round nose hunting rounds.
Link Posted: 5/20/2005 10:28:43 AM EDT
And a reply 34 seconds after my post... I haven't even gotten the poll up yet!

Link Posted: 5/20/2005 10:58:45 AM EDT
frangible ammo
Link Posted: 5/20/2005 11:34:46 AM EDT
They help with blanks but who cares
Link Posted: 5/20/2005 1:06:41 PM EDT
Link Posted: 5/20/2005 1:18:29 PM EDT

Originally Posted By mongo001:
Round nose hunting rounds.

Link Posted: 5/20/2005 3:01:00 PM EDT
[Last Edit: 5/20/2005 3:01:11 PM EDT by die-tryin]
ive shot 55gr, 62gr, 65gr, 75gr, subsonics & tracers and never had an issue.
Link Posted: 5/20/2005 3:04:37 PM EDT
Yes I have. I have a custom made 14.5" non chrome lined barrel with a rifle barrel extension mounted in a M4 ramped LMT receiver. This creates a lip of metal that the rounds coming out of the mag would sometimes catch on. So I WECSOG'd it and it's fine now and 100% reliable.
Link Posted: 5/20/2005 5:13:39 PM EDT
[Last Edit: 5/20/2005 5:16:01 PM EDT by WIZZO_ARAKM14]

But only because the drunken Monkies that assembled my M&A Parts M4 upper put an upper that was correctly cut for the ramps on a barrel with a RIFLE barrel extension.

Funny thing was, it worked for 1800rds and then started jamming like crazy.

15 minutes with a dremel after I got home from shooting, and I had an upper with "M4" feed ramps AND a barrel extension that had some newly acquired M4 feed ramps.

Other than that, the 3 other AR's I've been in contact with haven't needed them.


ETA: This guy held the upper while I was dremeling
Link Posted: 5/20/2005 5:49:22 PM EDT
I dremmeled the barrel feed ramps to match my LMT's ramps.

The Key is to take you time.
Link Posted: 5/20/2005 6:15:54 PM EDT
I have them on my M-4 but all I shoot is 55 and 62 gr FMJ Wolf Polymer through it. And like someone said, paper targets don't shoot back so I've never really been in a situation where I would need it to be 100% reliable. I just figured shoot, military has them on the M-4's for some reason so I should have them as well.
Link Posted: 5/20/2005 7:32:47 PM EDT
If they are benficial, why are they only on M4's and not all AR-15/M16's?
Link Posted: 5/20/2005 7:47:51 PM EDT
Link Posted: 5/20/2005 10:16:35 PM EDT

Originally Posted By BravoCompanyUSA:

Originally Posted By AR-M9:
If they are benficial, why are they only on M4's and not all AR-15/M16's?

Carbine vs Rifle lengths
different gas system/duration/pressure, etc
different cyclic rate

I don't get exactly what you mean, as now you can buy government profile barrels and a few others with the M4 ramps. They certainly aren't commonplace among most AR barrels, but definitely available. Colt, LMT, and Armalite all offer them, not to mention a couple upper makers offering true M4 uppers as well.

Link Posted: 5/21/2005 3:23:47 AM EDT
+1 on the round nose bullets!

I also played around with borderline mags that wouldn't work 100% with my upper with no extended feed ramps and those same mags worked 100% with my upper that had extended feed ramps.

IMHO, the feed ramps help lower the the tolerance for bullet type and magazine condition and those are all good things in my book. It's basically like extra reliability insurance and well worth the small increase in the price of the barrel. Actually if you shop around it seems like you can get barrels with exended feed ramps for about the price as those without.
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