Nice parts list, just wondering why you chose a switchblock. Are you planning on running a can (suppressor) on it? If so, why not get a surefire mb556/aac brakeout or blackout/yhm phantom so you can qd a can onto it before pinning and welding a MD on your barrel. Just a thought.
If you aren't gonna run a can, ditch the switchblock for a plain gas block.
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul