So I'm building my HK 7.62AR10 with a purpose of a DMR. So far I have a Leupold mark 8 CQBBS CMR-w 1.1-8x24mm Scope with a mark 8 AR mount, and a Geissele trigger ordered. for my next purchase I was interested in getting a Knights Armament MAMS muzzle brake. It comes in 2 threading variations. From what I understand is the 5/8-24 will fit how ever the factory threading is 1/10 an inch too long. Is there a spacer that I would need or can i send the barrel someplace to get cut down?