Research on this site, You will find all the info you need right here.
Capthowdy,
Thanks! I've been looking around for such info, it just seems so daunting.
Yakdung'
Thanks for giving me a starting point. It seems like there might be enough room to increase the capacity of the factory mags a round or two. Is there any way to do that? Also, I have a friend who suggest that I add a bullet guide if I use aftermarket magazines. Any truth to that? Course he shoots a .223, not a real caliber