I have a SP1 that I am thinking about updating. (Or not, the SP1 look is pretty nice...)
If I do, I will want to keep it Colt. Where can I get Colt uppers? Who will give me the best prices/service? I am thinking about a 20" A3-type upper, fwiw.
As long as I am here...I see that 'true' M4's have 1/7 barrels. What is supposed to be shot out of those? 62gr? How does a 1/7 handle 55gr?
Thanks in advance!