Breek Arms194201848
Breek Arms BRK4430 Echo Single Port Plan B Black Nitride Steel 1/2"x28 Threads 223 Cal/5.56mm$59.95
Availability: In Stock
Current Stock: Out of stock
The Breek Arms Sentinel is a closed-tine flash hider engineered for 5.56 NATO and .223 Remington rifles built around Plan B suppressor mounts. If you're assembling a 14.5" barrel and need to meet federal length requirements through pinning and welding, or if you're building a suppressor-ready upper with a Plan B interface, the Sentinel delivers the flash reduction and compact profile serious shooters demand without the bulk of traditional brakes or flash cans.
Built from 4140 hardened steel with a nitride finish, the Sentinel's fully shrouded design keeps the muzzle signature low and minimal—critical for both daytime shooting and NVG-compatible operations. The caged tine construction suppresses flash while eliminating the snag points that open-design devices can catch on slings, body armor, or gear. At just 2.15" long and 2.2 ounces, it adds virtually nothing to your rifle's profile or balance, making it equally at home on a precision build or a duty-ready carbine.
Threading is 1/2"x28 TPI—the standard for modern 5.56 platforms—and the Sentinel is optimized to work seamlessly with Plan B fast-attach suppressor mounts, giving you flexibility to run it bare or add a can without changing hardware. If you're pinning and welding for a permanently attached solution on a short-barrel build, the geometry is straightforward and proven.
| Brand | Breek Arms |
| Model | BRK4420 Sentinel |
| Caliber | .223 Remington / 5.56 NATO |
| Thread Pitch | 1/2"x28 TPI |
| Material | 4140 Hardened Steel |
| Finish | Black Nitride |
| Overall Length | 2.15" |
| Weight | 2.2 oz |
| Design | Closed-Tine, Fully Shrouded Flash Hider |
| Mount Type | Plan B Suppressor Mount Compatible |
Yes. The Sentinel is specifically engineered for Plan B fast-attach mounts, and it can be run with a suppressor or pinned and welded as a standalone flash hider.
Yes. The Sentinel is designed to be pinned and welded, making it a popular choice for builders who need to meet the 16" federal minimum overall length requirement on shorter barrels.
The Sentinel uses 1/2"x28 TPI threading, which is the standard for modern 5.56 NATO and .223 Remington rifles.
Yes. The shrouded design and closed-tine construction are optimized to reduce muzzle signature in a way that's compatible with night vision systems, keeping your flash footprint minimal in low-light conditions.
SKU: 197561679 • Width: 2.9in • Height: 1.1in • Depth: 4.8in • Weight: 0.17oz
Availability: In Stock
Current Stock: Out of stock
The Breek Arms Sentinel is a closed-tine flash hider engineered for 5.56 NATO and .223 Remington rifles built around Plan B suppressor mounts. If you're assembling a 14.5" barrel and need to meet federal length requirements through pinning and welding, or if you're building a suppressor-ready upper with a Plan B interface, the Sentinel delivers the flash reduction and compact profile serious shooters demand without the bulk of traditional brakes or flash cans.
Built from 4140 hardened steel with a nitride finish, the Sentinel's fully shrouded design keeps the muzzle signature low and minimal—critical for both daytime shooting and NVG-compatible operations. The caged tine construction suppresses flash while eliminating the snag points that open-design devices can catch on slings, body armor, or gear. At just 2.15" long and 2.2 ounces, it adds virtually nothing to your rifle's profile or balance, making it equally at home on a precision build or a duty-ready carbine.
Threading is 1/2"x28 TPI—the standard for modern 5.56 platforms—and the Sentinel is optimized to work seamlessly with Plan B fast-attach suppressor mounts, giving you flexibility to run it bare or add a can without changing hardware. If you're pinning and welding for a permanently attached solution on a short-barrel build, the geometry is straightforward and proven.
| Brand | Breek Arms |
| Model | BRK4420 Sentinel |
| Caliber | .223 Remington / 5.56 NATO |
| Thread Pitch | 1/2"x28 TPI |
| Material | 4140 Hardened Steel |
| Finish | Black Nitride |
| Overall Length | 2.15" |
| Weight | 2.2 oz |
| Design | Closed-Tine, Fully Shrouded Flash Hider |
| Mount Type | Plan B Suppressor Mount Compatible |
Yes. The Sentinel is specifically engineered for Plan B fast-attach mounts, and it can be run with a suppressor or pinned and welded as a standalone flash hider.
Yes. The Sentinel is designed to be pinned and welded, making it a popular choice for builders who need to meet the 16" federal minimum overall length requirement on shorter barrels.
The Sentinel uses 1/2"x28 TPI threading, which is the standard for modern 5.56 NATO and .223 Remington rifles.
Yes. The shrouded design and closed-tine construction are optimized to reduce muzzle signature in a way that's compatible with night vision systems, keeping your flash footprint minimal in low-light conditions.
SKU: 197561679 • Width: 2.9in • Height: 1.1in • Depth: 4.8in • Weight: 0.17oz