FOSSA - Multifunction Muzzle Device - now available in 5.56 and .30 cal/7.62 models. Features nominal flash and mitigated dust signature, fully compensated to reduce muzzle rise and reduce rearward recoil with no increase in concussion or noise level. Made from 17-4PH stainless steel. Surface is coated with either black oxide, or for hard use applications, a titanium aluminum nitride (TiAlN) coating. While titanium aluminum nitride might be over-kill for some applications, the finish is extremely durable and provides a low friction surface to minimize adhesion of carbon and copper. Note: these comps do not come with a crush washer, but they are available separately on our website for your convenience. 556 FOSSA has 1/2 x 28 threads and 7.62 FOSSA has 5/8 x 24 threads. 5.56 FOSSA price is $99 for black oxide and $109 for the TiAlN model. 7.62 black oxide FOSSA is $119.95.