This authentic Colt A2 Upper Receiver in anodized gray is a genuine New Old Stock component — original Colt production, never installed, never fired. The A2 upper receiver design served as the standard upper configuration for M16A2, M16A4, and early M4 platforms across all branches of U.S. military service, featuring the raised boss for the forward assist, brass deflector, and shell deflector geometry that defines the second-generation AR platform. Constructed from 7075-T6 forged aluminum with Colt's distinctive gray hardcoat anodize — lighter in tone than standard black mil-spec anodize — this receiver is correct for A2 and A3/A4 clone builds requiring period-accurate Colt markings and finish. The gray anodize is factory original, not refinished, making this a premium component for collectors and precision clone builders who demand authentic Colt parts. Compatible with all mil-spec bolt carrier groups, charging handles, and upper receiver components. NOS availability is extremely limited — these do not come back once they're gone. Pair with a period-correct lower, 20" or 14.5" A2-profile barrel, and triangular handguards to complete an authentic M16A2 or M4 display build. Order yours today before stock runs out.