If he SBR's the "pistol" it's still an in use gun. The lower sits there for (average running) 6-8 months. There's no right or wrong way to do it. I believe the OP's nervous being his first time in the game. What he doesn't realize is, it will not be his last.
While one's waiting for a F1 approval, why not throw a suppressor in there too![]()