Product Overview
Product Description
The Breek Arms Plan B Sentinel Caged Flash Hider in 5/8x24 brings fully shrouded, snag-free flash hiding performance scaled for .30 caliber. It carries the same closed-tine cage design, NVG-friendly flash containment, and Plan B/Atlas mount compatibility as the 5.56 variant, built for .308, .300 BLK, and other .30-caliber platforms.
Machined from 4140 hardened steel with a nitride finish, the Sentinel is designed for 5/8x24-threaded .30-caliber barrels with Plan B/Atlas suppressor mount compatibility and pin-and-weld capability. The closed-tine cage eliminates the snagging hazard of open prong designs for gear, brush, and vehicle operations while containing the muzzle flash from .30-caliber cartridges — where the larger powder charge produces a more visible fireball than 5.56 — within the shroud for a compact, NVG-friendly signature. Plan B and Atlas mount compatibility provides fast, tool-free suppressor transitions from the same muzzle device across calibers, allowing a single suppressor host to be used across multiple platforms sharing the Plan B ecosystem. The Sentinel is also engineered for pin-and-weld installation on barrel lengths where the muzzle device brings the configuration to the 16-inch federal minimum, providing a permanent, flush solution.
- Closed-tine, fully shrouded cage design
- Plan B and Atlas suppressor mount compatible
- Pin-and-weld capable
- Compatible with 5/8x24-threaded .30-caliber barrels
- 4140 hardened steel, nitride finish
- Peel washer included
- Made in the USA
Specifications:
- Design: Caged, closed-tine
- Mounting System: Plan B / Atlas Taper-Mount
- Caliber: .30 Caliber (.308, .300 BLK)
- Thread: 5/8x24
- Material: 4140 Hardened Steel, Nitride Finish
- Overall Length: 2.15"
- Weight: 1.8 oz
- Pin-and-Weld Capable: Yes
- Peel Washer: Included
