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View Full Version : Kac RAS rail system, lower rail loose. Know what the problem is, I need a fix.



556m16
04-18-14, 13:10
I have purchased 11 RAS rail systems to install on new weapons I own & some of the RAS rails lock up tight & some don't.
The issue is the lower rail, they lock up VERY tight at the barrel nut the issue is at the handguard cap.
Out of the 11 RAS rail systems 5 don't lock up tight, 4 colts produced during the 2008-2009 panic & 1 spikes that was produced during the 2012-2013 panic.
The colts were easy to fix because they had a mil-spec handguard cap with m203 cuts. A slight adjustment to the handguard cap with a brass hammer tightened the lower rail up on the colts.
The rails installed on the colts produced before the 2012 panic with no wiggle in the lower rail at all.
I believe the issue to be slight variation in the handguard cap dimensions.
I guess I will have to get out my dial calipers & find out if I am correct.
Does anybody have the proper dimension of what the handguard caps are supposed to be?
Has anybody else had the same problem & purchased the lower rail that locks on the barrel nut? Did it fix the play at the handguard cap?

Col_Crocs
04-18-14, 17:37
KAC makes a UK-SAS bottom rail assembly for the RAS, which has some type of locking mechanism.
Sorry, i have to ask... 11??? Why the same rail for 11 guns?

556m16
04-18-14, 18:09
KAC makes a UK-SAS bottom rail assembly for the RAS, which has some type of locking mechanism.
Sorry, i have to ask... 11??? Why the same rail for 11 guns?

Yea KAC told me about the rail but I would rather spend $5.00 on a proper sized handguard cap then $100.00 on a new lower rail.
I have 11 RAS rail systems because... Uhhhh... I Don't know good question.

Col_Crocs
04-18-14, 18:26
Lol! Are these guns all the same barrel length etc and are to be configured the same way?
I didn't realize they were $100 a pop.

556m16
04-18-14, 18:35
8 16 inch carbine's & 3 20 inch rifles.

Col_Crocs
04-18-14, 19:37
Don't take this the wrong way but how much time have you had behind your guns?

556m16
04-19-14, 07:27
Don't take this the wrong way but how much time have you had behind your guns?

Umm... Does standing in front of the mirror with an ar15 in my hand saying quotes from Rambo count?

Vec
04-19-14, 08:20
Umm... Does standing in front of the mirror with an ar15 in my hand saying quotes from Rambo count?


Hahahha... good one