First time moving the gas block and I discover the hole in the barrel is on a slant so it looks like they attach the gas block, then drill the hole so they're guaranteed to line up. If I move the gas block and drill a new hole, does it have to be on the slant like that or can I just drill the hole straight into the barrel? What size drill bit? What's the best/easiest way to do it? Any pointers and wisdom from experience would be appreciated.