|I'll echo what 'Vlad' stated above but had to shave (flat sand) approx .020 off the back of the provided threaded cover plate. The rear vertical edge of the plate would not slide up the existing rifle plate slot. Be very careful to sand flat square, little at a time and measure to fit several times.
One more BUT, the orig package was missing one scope ring screw and 'C' clamp. So I'm rating the mfg, B-Square one Bullet due to "dead responds" from them in requesting support from their so called 'customer support'. Three weeks ago, not a word with my second eMail. 1st and Last item from these people. LAST, I say!|