Defcon 1 AR-15 Rifle Thread-On Muzzle Brake - 1/2 x 28 - 9/16 x 24

Defcon 1 AR-15 Rifle Thread-On Muzzle Brake - 1/2 x 28 - 9/16 x 24 - 5/8 x 24 - 3/4 x 28 .

Defcon 1 CUSTOM rifle muzzle brake (unthreaded)

Guntec 1/2x28 Aluminum Faux Slip Over

Defcon 1 AR-15 Rifle Thread-On Muzzle Brake - 1/2 x 28 - 9/16 x 24 - 5/8 x 24 - 3/4 x 28 .

Defcon 1 AR-15 Rifle Thread-On Muzzle Brake - 1/2 x 28 - 9/16 x 24 - 5/8 x 24 - 3/4 x 28 .

SRC 1/2 x 28 .223 Flat Black DownForce Muzzle Brake - High Caliber Services Corp

Defcon 1 AR-15 Rifle Thread-On Muzzle Brake - 1/2 x 28 - 9/16 x 24 - 5/8 x 24 - 3/4 x 28 .

Defcon 1 AR-15 Rifle Thread-On Muzzle Brake - 1/2 x 28 - 9/16 x 24 - 5/8 x 24 - 3/4 x 28 .

Guntec AR-15 1/2x28 Micro Slip Over Barrel Muzzle Brake

Linear comps odd thread pitch looking for ideas