KAK PLAN B A7 FH 5/8X24 .375″ BORE

Description

The KAK Industry Plan B A7 Flash Hider is built for shooters running .308 / 7.62 NATO rifles who want a muzzle device that keeps the platform compatible with the Plan B quick-detach suppressor mounting system. The A7 flash hider designation refers to the seven-prong open-tine geometry, which vents propellant gases aggressively enough to suppress muzzle flash without trapping debris against a closed crown — a meaningful distinction when shooting in low-light conditions or from a prone position in the field.

The 5/8×24 thread pitch is the standard for .308-class barrels, and the .375-inch bore diameter is sized appropriately for that cartridge family, keeping bullet passage clearance tight enough to avoid gas bypass while leaving adequate margin for safe exit. The nitride finish provides surface hardness and corrosion resistance without adding the dimensional variability that can come from thicker coating processes, which matters when this device needs to index correctly for Plan B suppressor attachment. The result is a flash hider that functions well on its own and doubles as a dedicated mount point for shooters who plan to add a compatible suppressor later.

At roughly 3.9 inches in length, the A7 adds meaningful distance to the overall muzzle end, which is worth accounting for during handguard and rail clearance checks before installation. For .308 builds where Plan B compatibility is the end goal, this is the direct-thread starting point KAK designed the system around.