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Socratactical
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Posted: 10/19/2008 9:54:44 AM EST
What exactly to M4 feed ramps do that the average rifle feed ramp doesn't do? I've read that their purpose is mostly related to full auto/burst fire weapons.

Why do I want M4 Feed ramps in my next AR?
Do I NEED M4 ramps or do I just want them?

Can someone please explain? Thanks.
ftwm
6.8mm SPC Convert
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Posted: 10/19/2008 9:56:33 AM EST
They help if you shoot a lot of full-auto.

They also help with some of the alternative calibers, the 6.8 SPC cartridge feeds better in uppers/barrels with extended feed ramps.
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SERT103
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Posted: 10/19/2008 10:16:43 AM EST
I look at them more as a bonus than a neccesity. They can help improve feeding when shooting heavier loads. I look at it this way, they surely don't hurt anything.
TehLlama42
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Posted: 10/19/2008 10:19:03 AM EST
Extra tolerance for rounds that are fed low - poor magazines are the leading cause of AR malfunctions, and feed ramps can prevent a small number of those from occuring.

They're not a needed addon, but it's nice to have, and if there isn't a cost difference, they're better to have than not.

The ramps themselves are simply extended cuts on the upper receiver that are a continuation of the feed ramps on the barrel extension (See AR15Barrels.com for images) that are included in upper receivers from many manufacturers.
FN1889M
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Posted: 10/19/2008 10:19:56 AM EST
One thing - after spending some time looking for barrels, it seems that most "off the shelf" barrels now come with M4 feed ramps, whether or not they are needed. So you will probably need a receiver with M4 cuts if you want the receiver to match your barrel.
Boru
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Posted: 10/19/2008 12:26:54 PM EST
[Last Edit: 10/19/2008 12:31:07 PM EST by Boru]
If they can be lined up right and match perfectly to a particular upper and barrel, they are nice to have. If the barrel ramps do not match the upper ramps they can potentially reduce reliability. I`ve seen M4 cut barrel ramps hanging over the upper ramps creating a ledge for the rounds to get stuck on. I`ve also seen them off center, mostly because they just don`t match each other and can`t be lined up right.

I have 2 ARs with M4 cuts and they are OK, but having a couple bad experiences with the issues I mentioned has made M4 ramps a pet peeve of mine. I would rather not even have to deal with it. My other 3 ARs without them run fine. (none are FA)
Bite off more than you can chew, then chew it.
SERT103
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Posted: 10/19/2008 12:35:04 PM EST
Neither one of the rifles you have listed in your poll come with M4 feedramps, unless you can pick up the Texas DPS Bushmaster from GTDistributors. If your looking for M4 ramps, check out LMT, Colt, Noveske, BCM, Charles Daly and ADS rifles just to name a few.
"The strongest reason...to retain the RIGHT to keep and bear arms is to protect...against TYRANNY IN GOVERNMENT." Thomas Jefferson
ALPHAGHOST
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Posted: 10/20/2008 6:39:22 AM EST
damn it...its thurs again

you dont need em; check tacked threads
"I'm not stupid; y'all just retarded."--CJ
"Praise the Lord and pass the ammunition!"
"Si vis pacem, para bellum"