Is The GP Compatible With The Hero 5 Black Or 5 Session? Crystal November 11, 2017 00:39 Updated Follow The GP is not compatible with the Hero 5 black or Hero 5 Session mount. You can modify your Hero 3/4 bracket by filing down the U bracket as our engineer team did here to accommodate the Hero 5 Black or Hero 5 Session. Related articles What Is The Difference Between The GP And The GP PRO? Comments 0 comments Please sign in to leave a comment.