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Hi and welcome. Yes, crush washer is included: https://alpinerange.com/tacfire-tanker-muzzle-brake-tacfire-mz1009-3b-n-308-5-8x24-tpi-tankr-brk/ --------- Cheers and stay safe!

yes the crush washer is included "Tanker style muzzle brake is made of all steel construction with a heat treated, erosion resistant Black oxide finish. It comes with a .308 1/2"x28 thread pitch. Reduces recoil and barrel whip. This brake is perfect for rifles threaded in 1/2"x28 thread Crush washer included"

Yes sir, the crush washer is included >>> selwayarmory.com/product/ar15-223-556-tanker-style-muzzle-brake-1-2x28-thread-with-crush-washer-black-nitrided/ Stay safe & have a great day!