Product Description 3-chambered compensator manufactured specifically for the M400 TREAD to reduce recoil and muzzle rise with a 1/2 x 28 thread pitch. TREAD 3-CHAMBER COMPENSATOR, 5.56 MM, 1/2 X 28 at SIGSAUER.COM Browse all SIGSAUER.COM deals $79.99 In Stock at SIGSAUER.COM Buy Now at SIGSAUER.COM Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand Sig Sauer Sig Sauer