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AR15.COM
3/20/2011 3:54:11 AM EDT
1st question is about the mounting.  If I want to run a 12.37" rail, do I need a longer barrel nut, or will the stock barrel nut work?

2nd question is, are there any vendors that offer AR15 member discounts for the evolution rails?  I'm a cheap bastard and any cash I can save would be going toward a second Evolution rail.
3/22/2011 9:55:10 AM EDT
[#1]
Talked to Andrew at Sampson and just FYI, the 12.37" will work with the factory barrel nut.
4/14/2011 5:04:38 AM EDT
[#2]
That is correct,
All the EVO rails for the AR15 mount to the standard OEM barrel nut.
The thermal bushing is a little longer than the barrel nut and provides maximum support on all the rail lengths including the 15".