Thanks TJM... as you know, I have one MadBull barrel that I still haven't installed [] I switch to night shifts for a month starting this weekend and will have more spare time [since the wife and I will be on opposite work shifts ]and plan on putting my first Tiger back together again with your airsoft gun and new RX14 board. No drill press here - I guess I could make one instead. I believe there are some "how-to" guides in past posts.