Sons of Liberty Gun Works EXO3 5.56 Barreled Upper - 14.5" - No Muzzle

The Sons of Liberty Gun Works EXO3 14.5-inch barreled upper receiver group combines a Liberty Fighting Barrel, forged upper receiver, 4140 steel V2 gas block, and SOLGW's third-generation EXO3 seven-sided M-LOK handguard with no muzzle device — bare threaded — a duty-grade barreled upper for builders supplying their own BCG and charging handle.

The SOLGW M4-EXO3 14.5-inch barreled upper is a complete upper receiver group chambered in 5.56 NATO, featuring a 14.5-inch Liberty Fighting Barrel, a forged mil-spec upper receiver, a 4140 steel V2 gas block, a 13-inch EXO3 third-generation seven-sided M-LOK handguard with steel barrel nut, and no muzzle device — bare threaded muzzle. BCG and charging handle not included.

The EXO3 platform's third-generation handguard is the defining feature of this upper receiver group. The seven-sided M-LOK slot configuration provides accessory attachment positions at multiple angles around the handguard rather than only at the cardinal positions of a standard quad rail, allowing lights, lasers, and accessories to be positioned at the exact angle that best suits the shooter's support hand position and grip style. Anti-rotation tabs between the handguard and upper receiver prevent the handguard from rotating under load — a failure mode on handguards that rely only on the barrel nut for rotational stability — and the steel barrel nut provides a more rigid and durable connection than aluminum nuts under the thermal cycling and mechanical loads of sustained fire. The V2 gas block machined from 4140 steel provides a solid, efficient gas seal with the barrel without the galling risk of softer aluminum gas blocks over extended service. The Liberty Fighting Barrel delivers the accuracy and reliability that SOLGW builds into every rifle in their lineup. As with all SOLGW upper receiver groups, this ships without a BCG or charging handle — a builder's upper designed to accept the buyer's preferred components.

Caliber: 5.56 NATO. Barrel: 14.5 inches, Liberty Fighting Barrel. Rail: 13-inch EXO3 M-LOK, seven-sided, steel barrel nut. Gas block: 4140 steel V2. Muzzle: no muzzle device — bare threaded. Upper: forged mil-spec. BCG and charging handle: not included. ⚠️ No muzzle device — threaded bare. Builder must install a muzzle device before use on a rifle-length firearm.

EXO3 third-generation handguard features seven-sided M-LOK slots for maximum accessory positioning flexibility, anti-rotation tabs for handguard stability under load, and a steel barrel nut for rigid, durable upper connection. 4140 steel V2 gas block provides a solid, galling-resistant gas seal. Liberty Fighting Barrel meets SOLGW's full rifle accuracy and reliability standard.

The right barreled upper for duty and hard-use AR-15 builds where the shooter is supplying their own BCG and charging handle — SOLGW's EXO3 platform in a 14.5-inch 5.56 configuration built to the same standard as their complete rifles.