Spike's Tactical creates quality parts, uppers, and complete rifles. Each component is manufactured to Mil-spec standards and are backed by the Spikes Tactical lifetime warranty. This particular upper receiver features a 14.5" pinned cold hammer forged chrome-moly vanadium mil-spec barrel with a 1:7" twist rate. It also features a mid length gas system with a Spikes SAR3 quad rail, and the Spike's mil-spec M16 bolt carrier group.

Specifications and Features:
Spikes Tactical Upper Receiver STU5050-S2D
5.56mm NATO (accepts .223 Remington)
14.5" Pinned (meets 16" OAL) Lightweight LE Barrel
Cold hammer forged, Chrome-moly vanadium mil-spec barrel
1:7" Twist
Mid Length gas system
Low profile .750" diameter gas seat
Spikes Tactical mil-spec M16 bolt carrier group
Spike's Tactical SAR3 12" quad rail
Dynacomp Extreme Pinned
Upper receiver is 7075-T6 forged flattop
Made in the USA