Breek Arms BRK4420 Sentinel Caged Plan B Black Nitride Steel 1/2"x28 Threads 223 Cal/5.56mm

The Sentinel is a closed-tine, fully shrouded design for superior flash suppression and to reduce snagging on gear. Built for Plan B mounts and pin-and-weld builds, it delivers rock-solid alignment, compact length, and NVG-friendly signature reduction.