My local shop has a large number of police turn-in Glocks. 19s, 17s, 22s, 23s, 31s and a 32. All are priced @ $375 with one or two @$400. Most have some holster wear (slight) and seem in good shape cosmetically. All but 2 are Gen 3 guns. All come with 2 or 3 hi cap mags. How do you check if a Glock is mechanically sound? Is there a process to check it's mechanical condition? I heard that there is a test you do where you press down on the chamber or something to see if the barrel moves down???? Are these good prices? Thanks guys.