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Yankee Hill Machine – Annihilator Muzzle Brake 5.56mm, 1/2-28 TPI$47.00Annihilator Muzzle Brake 5.56mm 1/2-28 TPI. Four-port aggressive design has no downward facing ports which helps eliminate dust problems when shooting from the prone position. Made from 41L40 heat treated steel RC26-34. Threaded at 1/2-28 tpi. Includes crush washer.