07-24-2011, 03:17 PM
New to the forum and I'm building a tactical Grendel on a Spike's upper and lower. Bought one of the discontinued Liberty 16" button-rifled barrels with bolt from Satern. Haven't received it yet but I think it is .750 over the gas block. I plan on using a Vltor clamp-on gas block. Is there anything I can do to insure proper gassing (gas port hole size, etc.) before I put everything together? I live in Jersey and have to have a pinned muzzle brake on this thing. The gas block has to go on first and I want everything to be right the first time. Any suggestions greatly appreciated!