Breek Arms Sentinel Caged flash hider for .223/5.56 with 1/2×28 TPI; nitride-finished 4140 steel, Plan B compatible and intended for pin-and-weld builds.
The Breek Arms Sentinel is a closed-tine, fully shrouded flash hider designed for .223 Rem / 5.56 NATO applications. Its caged profile reduces visible muzzle flash while minimizing snagging on gear. The unit is built for compatibility with Plan B suppressor mounts and for use in pinned-and-welded builds to meet barrel length regulations. The design also emphasizes compact length and a reduced NVG signature for low-profile mounting.
Product Specifications
The brand is Breek Arms.
The model is the Sentinel Caged.
The manufacturer part number is BRK4420.
The caliber is listed as .223 Rem / 5.56 NATO.
The thread pitch is 1/2 x 28 TPI.
The material is specified as 4140 hardened steel with a nitride treatment.
The finish is Nitride.
The weight is 2.2 oz.
The overall length is 2.15 inches.
The design is a closed-tine, fully shrouded profile engineered to reduce flash and snagging with a NVG-friendly signature.
The unit is built for fast attach for Plan B suppressor mounts.
It is engineered to be pinned & elded on 14.5″ barrels to meet the 16″ Federal minimum length requirement.
The threads are specified as 1/2-28.
The UPC is 812296031763.
The Sentinel Caged offers a pragmatic balance of compact form and functional compatibility for builders and shooters who require Plan B mount readiness and straightforward compliance options. Its shrouded profile and hardened-nitride construction make it a durable choice for suppressed setups and compliant rifle builds.
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