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The interface on the bottom of the optic has been changed. There is some kind of extended lug that is completely different now, and it required some hamfisting (unfortunately) to fit. I notified Tier One, sent photos, and they’re working on it.

The interface on the bottom of the optic has been changed. There is some kind of extended lug that is completely different now, and it required some hamfisting (unfortunately) to fit. I notified Tier One, sent photos, and they’re working on it.

I have the 635r on a modified tier one qd mount, I can float it between rifles. It’s currently on a brand new K1. Awesome optic and rifle, still figuring both out!! Would love a remote ranging button like I have on the Atn though.