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12/14/2008 7:10:45 AM EDT
Does anyone know if Colt used a small pin hole on this lower?  It looks like a standard A2 style lower.  Also, would the upper be large or small hole?  

I ask because I just bought a R6551, but haven't picked it up yet.  I have been searching the net, but cannot find any real info as to when Colt went to standard size pin holes.  Does anyone have a web or print reference that would contain this info?

Thanks!
12/14/2008 12:24:59 PM EDT
[#1]
You will have to wait till you get it, we are not psychic.
12/14/2008 12:40:12 PM EDT
[#2]
did you buy the 6551 from someone here on the board?
12/14/2008 1:02:59 PM EDT
[#3]
try here:

http://www.biggerhammer.net/ar15/variants/
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