Original 14.5" colt M16 upper, A1 config but Colt put these on A2 carbines for a while (you know Colt's practices) very good condition, about 750 rounds. Looks nice. A few minor finish imperfections. Colt carrier with MPC bolt, Colt handguards, CMP B barrel. 1:12 twist barrel. Bayonet will fit this barrel correctly, unlike the 16"
$750 or trade for good complete rifle.
Of course, all NFA rules apply