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Posted: 3/12/2006 1:56:42 PM EDT
What uppers can take a KAC M4 RAS? Which ones can't?

I can't seem to find the thread on this, but I found the tacked one but my answer wasn't in there.
Link Posted: 3/12/2006 2:11:27 PM EDT
Well for starters, the upper must have a government profile carbine barrel and gas system. No HBARs. Pretty much all uppers available commercially should work. Colt, LMT, Bravo Co., RRA, Bushmasters, etc.
Link Posted: 3/12/2006 2:12:01 PM EDT
Bushy 11.5" hbar upper works fine.
Link Posted: 3/12/2006 2:27:57 PM EDT
I stand corrected. I thought the RIS can go either way and the RAS was for gov't profile.
Link Posted: 3/12/2006 4:17:50 PM EDT
well..unless my RAS is a RIS..at least it works good on my 11.5" bushy.
Link Posted: 3/12/2006 4:46:27 PM EDT
I'm not sure where that RAS/RIS fit business comes from 'cause I've had an RAS on the following...

Colt 16" gov't profile
Colt 16" 9mm lightweight
Colt 16" HBAR
LMT 16" gov't profile
LMT 14.5" gov't profile
Bushmaster 16" HBAR
Link Posted: 3/12/2006 5:45:41 PM EDT
The RAS will fit all but the thickest barrels. Don't know the measurement off hand. I think the RAS is far superior to the RIS with the lock-up of the top piece which the RIS doesn't have. JMHO
Link Posted: 3/20/2006 10:16:39 PM EDT
CMMG M4A1 SOCOM barrel uppers are good to go as well. Just got my KAC M4 RAS installed no problems, although I did scuff the slipring a bit on one side.
Link Posted: 3/21/2006 4:26:30 AM EDT
my ras fits my 6721 hbar upper no prob. i asked this question last week. search for it and there is a pic of one mounted on a hbar.
Link Posted: 3/21/2006 6:01:47 AM EDT
I have two Bushmaster 14.5" M4 barrels. My RAS doesn't seem to want to go on either one.. What am I missing here?
Link Posted: 3/21/2006 6:53:48 AM EDT
KAC RAS on a Colt 6721 HBAR.

Link Posted: 3/21/2006 8:39:40 PM EDT
KAC M4 RAS on a CMMG M4A1 SOCOM upper (med weight barrel).


Link Posted: 3/21/2006 8:41:32 PM EDT

Originally Posted By JustinOK34:
I have two Bushmaster 14.5" M4 barrels. My RAS doesn't seem to want to go on either one.. What am I missing here?



Make sure the rear link is hanging and goes under the barrel nut before pushing the rear of the upper handguard down into place.
Link Posted: 3/21/2006 9:11:18 PM EDT

Originally Posted By nf9648:

Originally Posted By JustinOK34:
I have two Bushmaster 14.5" M4 barrels. My RAS doesn't seem to want to go on either one.. What am I missing here?



Make sure the rear link is hanging and goes under the barrel nut before pushing the rear of the upper handguard down into place.



Awesome, thanks!
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