Finish is Nitride, which is significantly more rugged/durable than the original Phosphate finish. 1:7 can shoot anything you can buy, including 77gr heavies (mk262), 75gr TAP and Tracers (1983 - current).The choice if you want the closest possible to the real thing and will only shoot 55gr bullets. 1:12 is the only twist rate used on all Colt models from 1963-1983.The only reason we even bother to offer two different Chrome BCG's is because of the noticeable cost difference between the two. and more than likely on Air Force models. So it was not uncommon to see 602's in the war having BCG's with serrations. Though originally shipped with a "slick side" BCG, starting around 1964/65 the Army switched to Chrome M16 carriers with serrations - and therefore so did the Air Force even though their guns didn't have Forward Assists (to simplify spare parts logistics). Chrome M16A1 - has serrations on the side (to work with the Forward Assist). Original 1:12 twist (1:7 optional), Chrome Lined.Chrome "Slick Side" BCG, with appropriate "machined" Retaining Pin (not Cotter Pin).
#Colt ar 15 models code#
"Slick Side" Mil-Spec Upper, "C" "A" forge code (not NoDak).Genuine Colt AR-15 Fiberglass Handguards (not polymer).Available with or without Chrome BCG with machined retaining pin. This is a highly authentic reproduction of the Colt 602 / 604 with Charging Handle. Flash hider improved to the stronger "3 Prong" (with which we are all familiar).Charging Handle changed to the standard version still used today.This is also the version officially adopted by the Air Force as the Colt model 604 M16 (1963-1966). After initial testing of the Model 601, the US Army asked for a number of changes - resulting in the Colt model 602 (1963-1964).
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