aalbert Posted December 9, 2018 Author Share Posted December 9, 2018 I am new to the X5 game, but from all of my research late summer of 2017 SIG changed from the Stainless barrel to the black barrel, shortly thereafter they also announced the volunteer trigger upgrade program... So in my mind, the gen 1.5 cutoff is marked by that - when they transitioned from the stainless to black and resolved the trigger issues. Link to comment Share on other sites More sharing options...
bluesky Posted December 9, 2018 Share Posted December 9, 2018 Thank you for explaining. Link to comment Share on other sites More sharing options...
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