Bear Creek Arsenal BC-15 5.56 NATO Upper Receiver - AR-15 Complete Upper - 10.5"

A compact 5.56 upper with a right-side charging handle ready for your mil-spec lower. The Bear Creek Arsenal BC-15 5.56 NATO Complete Upper ships with a BCG and charging handle installed, built around a 10.5-inch barrel with a 1:7 twist and 10-inch M-LOK rail for compact AR-15 pistol and SBR configurations.

The Bear Creek Arsenal BC-15 5.56 NATO Complete Upper is a mil-spec AR-15 complete upper assembly with bolt carrier group and right-side charging handle included, featuring a 10.5-inch barrel with a 1:7 twist and 10-inch M-LOK handguard rail.

Three specs define this upper for compact 5.56 builds. The 10.5-inch barrel provides the most common SBR and pistol configuration length for 5.56 NATO, balancing maneuverability against the velocity loss that shorter barrels impose — a practical compromise that keeps the platform functional across standard 5.56 duty ammunition. A 1:7 twist rate stabilizes the full range of commonly available 5.56 projectile weights from lightweight 55-grain FMJs to heavier 77-grain match loads, maintaining versatility across training and defensive ammunition without requiring load-specific barrel selection. The 10-inch M-LOK rail provides ample mounting real estate for lights, grips, pressure pads, and accessories across the full handguard length without the weight and bulk of a full-Picatinny design.

Compatible with mil-spec AR-15 lower receivers. Includes BCG and right-side charging handle. 10-inch M-LOK handguard.

1:7 twist. 10-inch M-LOK rail. Right-side charging handle.

Built for compact 5.56 AR pistol and SBR configurations requiring a complete, BCG-ready upper at 10.5 inches.

By Bear Creek Arsenal. BCG and charging handle included. Standard Bear Creek Arsenal warranty applies.