I'd take any and all advice that scenarshooter has. I'll just add that I'd skip the PTG bottom metal. Too many reports of it not latching properly (although mine is fine so far).
You shouldn't have trouble shooting bug holes with any GAP chambering. Be sure to give us a report when you get it!
Okay, good information. I hadn't heard that. GAP acted like it was their preferred bottom metal for a BDL style setup. I was leaning toward the M4 originally.
