Bolt Broke What do I need to replace it with?

[pwbum1]

I have a Model 1 16" CAR 6.5 sporter. I broke a few bolt lugs and I am looking to replace the bolt. I am hoping someon can help me out with information. Can I use the AA bolt in the moodel with a drop in fit and shoot or do I need to do something becaus eof the recessed face. I read on another forum that the model 1 sporter bolt is a 7.62x39 bolt. Woudl that be my plug and play bolt? I would prefer the AA but plug and play is what I am looking for. Any help woudl be greatly appreciated. On another note what would cause the bolt lugs to shear off by the exctractor?