There is also the G402 (a.k.a. Hyperion Fury) it's basically the G502 minus a few of the G502 premium bells and whistle with a reworked set of button placements.

During my gaming sessions so far I did not encountered any issue with pressing the left 'Sniper button', you will feel it however you hand to muscle memory would just tend to ignore it. Also you can download and use the Logitech Gaming Software to reassign or just disable the button without any further issue.