Q Sugar Weasel .300 BLK Upper Receiver - AR-15 Complete Upper - 7"

Q's Sugar Weasel upper — finally available separately. The Q Sugar Weasel .300 BLK Complete Upper ships with a BCG and charging handle included, built around a 7-inch 1:5 twist tapered .300 BLK barrel with a 5/8x24 threaded muzzle and adjustable pistol-length gas block, designed as a replacement upper for the Sugar Weasel platform or as the starting point for a custom suppressor-host build.

The Q Sugar Weasel .300 BLK Complete Upper is a 7-inch .300 BLK AR-15 complete upper assembly with bolt carrier group and charging handle included, featuring a tapered 1:5 twist barrel with 5/8x24 threads and adjustable pistol-length gas block, in black.

Three features define the Sugar Weasel upper's .300 BLK suppressor-host capability. The 1:5 twist rate is optimized for the heavier subsonic .300 BLK projectiles in the 200–240 grain range that maximally leveraged suppressor performance demands, providing the spin rate that stabilizes these heavy, slow bullets reliably where a standard 1:8 or 1:10 twist can leave heavy subsonic loads marginally stable. The adjustable gas block provides user-accessible gas adjustment for the increased backpressure of suppressed subsonic fire, enabling the shooter to dial in reliable cycling without replacing buffers or springs as the suppressor configuration changes. The 5/8x24 threaded muzzle accommodates the range of .30-caliber suppressor mounts and muzzle devices that support both direct-thread and QD attachment interfaces.

Compatible with mil-spec AR-15 lower receivers. 7-inch barrel, 5/8x24 threaded muzzle. 1:5 twist. Adjustable pistol-length gas block. BCG and charging handle included.

.300 BLK. 1:5 twist. Adjustable gas block. Pistol-length gas system. Black. Includes BCG and charging handle.

Built for suppressor-host .300 BLK pistol and SBR builds where the Sugar Weasel platform's 7-inch configuration and 1:5 twist rate are the design requirements.

By Q. BCG and charging handle included. Standard Q warranty applies.