My Colt A4 has a Vltor carbine extension, carbine spring, H2 or H6 buffer, Vltor Modstock, carry handle sights, and KAC rail. With 62 gr CBC it carries downrange very well. I use 6920s mostly, but that A4 is like shooting a Cadillac. When I was younger an A2 was my weapon of choice, I wish I still had one.
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