I recently purchased a "used", and by used I mean bought and not shot, G17 at a local gun shop and it had one mag that came with it originally and a new the shop through in. But by looking at the 2 I can tell some subtle differences in the metal on the inside etc. Just curious if there was an update and what the exact difference is, if any. Both work same no problems. I can try and get some pics up if you need to see. Thanks.