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Page AR-15 » Build It Yourself
AR Sponsor: bravocompany
Posted: 4/19/2007 6:48:57 PM EDT
title says it all  just curious guys
Link Posted: 4/20/2007 3:20:19 AM EDT
As long as your Colt lower has 1/4" take down and pivot pins, then any upper will fit directly to it.  If your pivot pin is of a bigger diameter (~8mm), then you can still put a RRA upper on it, but you'll need an adaptor pin.
Page AR-15 » Build It Yourself
AR Sponsor: bravocompany
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