The Breek Arms Plan B Sentinel Caged Flash Hider is a closed-cage muzzle device for .30 caliber rifles with a 5/8×24 threaded muzzle (Breek Arms part no. BRK4421). Breek Arms lists the Sentinel Caged among its Plan B muzzle devices, which pair with the Plan B HUB One suppressor mount so a shooter can move between a flash hider and a suppressor on the same barrel. The cage design surrounds the muzzle blast, which cuts visible flash and avoids the open prongs that can catch on brush or gear. It is a muzzle device, not a suppressor, and it carries a black nitride steel finish that holds up to hard use.

Key Specifications

• The device is a caged flash hider, which surrounds the muzzle blast to reduce visible flash.
• It is made for .30 caliber rifles, matching the 5/8×24 thread size.
• The thread is 5/8×24, the common pattern for .30 caliber and 7.62 rifles.
• The material is 4140 hardened steel, a tough alloy that stands up to repeated firing.
• The finish is nitride, a hard surface treatment that resists wear and corrosion, in black.
• Overall length is 2.15 inches, a compact size that adds little to the muzzle.
• Weight is 1.8 ounces, light enough that it does not upset the balance of the rifle.
• The exit hole measures 0.369 inches, which makes the device compatible with 9mm as well.
• The closed-tine shrouded design removes the open prongs that can snag on brush, slings and gear.
• It belongs to Breek Arms’s Plan B muzzle device system, which is designed to work with the Plan B HUB One suppressor mount.

Frequently Asked Questions

What rifles does this flash hider fit? It is the .30 caliber version with a 5/8×24 thread, so it fits rifles with a 5/8×24 threaded muzzle. Check your barrel’s thread pitch before you order.

Is this a suppressor? No. It is a flash hider, a muzzle device that reduces visible flash. It is part of Breek Arms’s Plan B system, which can also be used with the company’s Plan B HUB One suppressor mount.

What is the difference between a caged and a prong flash hider? A caged design closes the end of the device around the muzzle, while a prong design leaves open tines. Breek Arms also sells an open-prong Scorch flash hider in the Plan B line.

Buy the Breek Arms Plan B Sentinel Caged Flash Hider

If you want a flash hider that will not snag and can later share a mount with a suppressor, the Sentinel Caged is built for that. Order it from our Lubbock, Texas shop for fast, direct shipping, and see more muzzle device parts and accessories in the same category.