I got another new gun, its a subcompact Glock 27 .40 Caliber. I havent had a chance to shoot it yet. The gun: The Gen 4's are coming with these little beaver tailed backstraps now, I was unaware of this until I recieved the gun. Full size magazines will interchange as long as they are the same caliber. Here it is compared to a full size Glock 22 which is a 40 caliber as well: Ill write a little more about after I shoot it.