Shop › SCO ASR MUZZLE BRAKE 5/8"X32 .458CAL SCO ASR MUZZLE BRAKE 5/8"X32 .458CAL $79.90 SilencerCo Hybrid ASR Muzzle Brake, 5/8x32,.46 Diameter (Rock River Socom) AC1557 Quantity: Add To Cart Added! SilencerCo Hybrid ASR Muzzle Brake, 5/8x32,.46 Diameter (Rock River Socom) AC1557