Bear Creek Arsenal | 300 B/O 10-inch Upper | 1:7 Twist

Bear Creek Arsenal’s 300 B/O complete upper assembles a compact AR-15 upper with a 10-inch barrel, 1:7 twist rate, pistol-length gas system and an M-LOK handguard. The unit ships as a complete upper assembly intended for use on AR-15 platform lowers configured for 300 B/O. Its short barrel and pistol-length gas design suit compact, short-range precision work and suppressed shooting setups. The handguard’s M-LOK slots permit low-profile mounting of accessories along the forend.

Product Specifications

• The manufacturer is Bear Creek Arsenal.
• The model name is BEAR CREEK ARSENAL 300 B/O COMPLETE UPPER 10.” BRL 1:7 TWIST PISTOL LENGTH GAS MLOK.
• The caliber is listed as 300 B/O.
• The barrel length is 10 inches.
• The rifling twist rate is 1:7.
• The gas system is a pistol-length configuration.
• The handguard interface is M-LOK.
• The listing is for a complete upper assembly.
• This part is intended for the AR-15 platform and AR-15 style lowers.
• The UPC is 756542288085.
• The product image is available at https://cdn28.coreware.com/cache/image-full-86391-c4a13b869c1ad5ab4748fb145d4ced25.png.

This complete upper provides a factory-matched set of components for builders seeking a compact 300 B/O AR-15 configuration with a short barrel and pistol-length gas system. Its M-LOK handguard offers straightforward accessory mounting while the 1:7 twist supports a broad range of bullet weights commonly used in this caliber. For users assembling compact rifles or suppressed systems, this upper supplies the core features needed for those builds without speculative claims about unspecified details.