Expo Arms Barreled AR-15 Upper Receiver - 5.56 - 10.5"

This Expo Arms Barreled AR-15 Upper Receiver is overrun stock at a value price — a complete 10.5" 5.56 NATO upper ready to drop onto any mil-spec lower for a compact AR-pistol or SBR build.

Features:

• 10.5" barrel chambered in 5.56 NATO, 1:8 twist
• 1/2x28 threaded muzzle with flash hider
• Carbine-length direct-impingement gas system
• Free-float M-LOK handguard
• Overrun stock — availability may be limited
• Bolt carrier group and charging handle not included

The 1:8 twist stabilizes the full range of common 5.56 projectile weights, from 55-grain training loads to 77-grain match bullets, so you're not locked into a narrow ammo selection. The free-float M-LOK handguard isolates the barrel from accessory-induced flex, keeping point of impact consistent regardless of grip pressure or mounted gear.

As overrun stock, this is a value-priced starting point for a compact custom build, though supply is limited and may not be restocked once sold out. It installs on any mil-spec AR-15 lower and just needs a BCG and charging handle to complete the build.

The 1/2x28 threaded muzzle ships with a flash hider already installed, so there's one less part to source before this upper is ready to mount and shoot.

Expo Arms builds mil-spec AR-15 components exclusively for Primary Arms, backed by a limited lifetime warranty against manufacturer defects.