Breek Arms BRK4420 Sentinel Caged Plan B Black Nitride Steel 1/2″x28 Threads 223 Cal/5.56mm
January 22, 2026
Breek Arms BRK4431 Echo Single Port Plan B Black Nitride Steel 5/8″x24 Threads 30 Cal
January 22, 2026
Breek Arms BRK4421 Sentinel Caged Plan B Black Nitride Steel 5/8″x24 Threads 30 Cal
$59.95
Breek Arms BRK4421 Sentinel Caged Plan B Black Nitride Steel 5/8″x24 Threads 30 Cal
93 in stock
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.
| UPC | 812296031770 |
|---|---|
| Manufacturer | BREEK |
| Manufacturer Part Number | BRK4421 |
| Model | Sentinel Caged |
| Thread Pattern | 5/8"x24 |
| Caliber/Gauge | .30 Caliber |