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It takes Walther P99 sights. I'd contact Mec-Gar since they supply the mags that come with it.
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The Canik-55 TP9 takes Walther P99 night sights. The set of Meprolight P99 sights that I put on mine fit right on, but the rear sight required you to use the cross adjustment screw from the original TP9 sight, and you also had to use the original screw and spring from the TP9 that 'retains' the square headed cross adjustment screw. The front sight just sets on the top of the slide and is retained by the Glock-like hex-headed screw.
The Canik TP9SA rear sight comes without the cross adjustment screw and I haven't fiddled with it enough to see if the screw and spring that retain the cross adjustment screw (when it's there) are contained in the slide underneath the TP9SA rear sight. In addition, the front sight of the TP9SA is recessed into the top of the slide with a rounded rear end. The Meprolight P99 front sight is square backed and would leave a space in the milled slot in the top of the slide even if the holes for the retaining screws lined up correctly for attaching the front sight.
Just sayin'...
Forrest