Description
Overrun stock at a value price — a complete Expo Arms barreled upper ready to drop onto your mil-spec lower. The Expo Arms 5.56 NATO Barreled Upper Receiver Group delivers a 10.5-inch 1:8 twist barrel on a carbine direct-impingement gas system with a free-float M-LOK handguard and flash hider, without a BCG or charging handle, giving you the flexibility to run your preferred components.
The Expo Arms 5.56 NATO AR-15 Barreled Upper Receiver Group is a 10.5-inch direct-impingement carbine-length gas system barreled upper for mil-spec AR-15 lower receivers, featuring a 1:8 twist 1/2x28 threaded barrel, free-float M-LOK handguard, and flash hider. BCG and charging handle not included. Overrun stock.
Three features define this upper's value for compact 5.56 builds. The 10.5-inch barrel provides the most common compact AR-15 pistol and SBR configuration length, balancing maneuverability with sufficient dwell time for reliable cycling on a carbine-length direct-impingement gas system. A 1:8 twist rate stabilizes the full range of commonly available 5.56 projectile weights from 55-grain training loads to 77-grain match projectiles, maintaining versatility across the ammunition spectrum without load-specific limitations. The free-float M-LOK handguard provides direct accessory attachment for lights, grips, and other hardware while isolating the barrel from handguard contact forces that can affect point-of-impact consistency under varying grip pressure.
Compatible with mil-spec AR-15 lower receivers. 10.5-inch barrel, 1/2x28 threaded muzzle. Carbine-length direct-impingement gas system. BCG and charging handle not included.
5.56 NATO. 1:8 twist. Carbine direct-impingement gas system. Free-float M-LOK handguard. Flash hider.
Built for compact AR-15 pistol and SBR configurations where a value-priced overrun barreled upper is the right starting point for a custom short-barrel build.
By Expo Arms. Overrun stock — availability may be limited. BCG and charging handle not included. Standard Expo Arms warranty applies.
– Barrel Length: 10.5
– Brand: Expo Arms
– Caliber: 5.56 NATO
– Color: Black
– Finish: Hardcoat Anodized
– Gas System Length: Carbine
– Gas System Type: Direct Impingement
– Handguard: 10 in Freefloat Rail
– Platform: AR-15
– Thread Pattern: 1/2 X 28
– Twist Rate: 1:8
SKU: XP-URG-556-105-OR
MPN: XP-URG-556-105-OR
