Hello, I would like to know more about the new Colt AR-15 I just purchased. I found some basic info such as GC=Government Carbine but would like to know the original build configuration and date of the rifle. It is a Colt AR-15 A2/M4 6520 w/A3 upper, 14.5" 1/9 barrel, 2" FH, pistol grip, 2-position telescoping buttstock, bayo-lug. Would
like to know if this was the original build configuration of this rifle or if was a piece-job.
Thanks!