I have a few questions: Does anyone know much if anything about Mech Tech System Inc.? Does anyone know where to get just the Glock model 21 frame? Is there any rifles ready to go that accept .45 acp glock model 21 magazines? I know that kel tec has the sub2000 in 9mm and .45acp, but I haven't found a rifle in .45 other than the Thompson. Wanna kill these ads? We can help!