Leaderboard

Top to bottom: GGG, Taran, GGG, Tac2 Nordic round

I've tried both. They each worked just fine and I didn't have any issues arise with either. The GGG machines a slot in the factory release mechanism that orients the button properly. The Tac2 doesn't do that. While I never had problems with either, personally I went with the round Nordic button (you have to do your own drill/tap for that one). The factory mechanism's post is a press fit into the internal mechanism and can loosen with use or a direct hit on the release button. If that happens, the rectangular release buttons on the Tac2 & GGG can kind of spin around and get out of position and interfere with your operation of the bolt. If the release button is round and it spins around there's no similar ill effect. That's my story anyway.

You’re right. The 16mm makes more sense. I think I used the 8’s when the Noveske adapter plate is in play.