The White Sound Defense FOSSA-556 is one of my favorite muzzle devices. It completely eliminates flash on all the ammo that I have tried it with and it adds a measure of muzzle rise reduction as an added bonus. White Sound Defense is now working on a 7.62 version called the FOSSA-762. They recently released a teaser image of a prototype device mounted on an ArmaLite AR10A SuperSASS.
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