I may have a chance to put my hands on the pistol made in July/August 1992 (serial # ACU666). Second generation G21 - little to no use. My question is: - is this gun safe to use? I've heard about some kind of 1992 upgrade/re-call. Any idea what that was all about? Also - will the newer Glock magazines work in such pistol? Thanks! Wanna kill these ads? We can help!