Here's a quick picture of internal sorry Im not gonna tear the firing parts apart since I last time I fiddle with em it took me 1/2 day to put it back together properly
http://smg.photobucket.com/albums/v6...OC%20Internal/
The bolt catch part is significantly different. I'm just gonna play the devil's advocate saying it wont work for criminal mac... Sorry if I offended you, =P, you have my respect man