All of the 223AIs I've done feed from AICS mags sans an issue.
As far as FB, its up to you. I spec'ed this reamer long ago to be able to shoot 75/80s yet still touch with 50s. It's worked too well to even consider something else.
Mine is a .252" neck with .032" FB.
I and most of the AIs I've built shoot 80grn Bergers and the like. They hammmer.
Good luck with your build, you will enjoy the shit out of a good 223AI.
KillSwitch,
I've had both of my DC/CC accounts stolen in the last month. I haven't bought anything from bullets.com in a while, but definitely have the others.
E.T.A. I do all my PTG stuff over the phone. If that makes any difference.
Ryan and Scott,
Great match. I enjoyed every bit of it. I look forward to this match every year!
Big thanks to all the match sponsors. There were a bunch, but a big thanks to Precision Tactical Arms Company and Accuracy Addiction. Your efforts for this match were awesome.
Most...
I too have had several containers of Devcon hardner go to shit. I finally called Devcon and the fellow I talked to had been hearing of this problem and promptly sent another kit. It too went to crap in a pretty short time. Switched to Marine Tex and haven't looked back.