Phase 5 littleBOY Hex Brake .223 Rem/5.56 NATO AR-15 Muzzle Brake with Crush Washer 1/2x28 TPI - Aerospace Arms
Honest and perhaps ignorant question: which muzzle device has the lowest decibel for the shooter? : r/ar15
ATI Outdoors AR-15 Steel Shark Muzzle Brake, 5.56 NATO/.223 Remington - 708297, Rifle Barrels & Accessories at Sportsman's Guide