Brownells BRN-16A1 5.56 NATO 20" Upper Receiver 1-12 Twist

The BRN-16A1 is Brownells' complete upper built in the pattern of the late 1960s issued M16A1. It carries a 20" rifle length barrel chambered in 5.56 NATO with a chrome lined bore and chamber, and this version uses the 1-12 twist that Brownells pairs with 55 grain bullets.

Period details are all there: an upper without a shell deflector, teardrop forward assist, M16A1 ejection port cover, A1 rear sight and A1 polymer handguards with heat shields. The muzzle wears an A1 flash hider held by a split washer. A manganese phosphate mil spec bolt carrier group is included, so it only needs a lower to finish a retro rifle.