The plate should work with the Echelon when it is in the RMR optic pocket configuration.
No, this will not work with the Canik TTI combat.
Yes, Aimpoint sells the plate for the FN-45... $60.00
The Primary Machine Trijicon RMR to Aimpoint Acro Adaptor may work on a Killer Innovations P320 RMR Cut Slide. The Primary Machine Trijicon RMR to Aimpoint Acro Adaptor will work with milled slides that are 0 to 0.150" deep. I recommend contacting Killer Innovations to see how deep the slide cut is in order to confirm compatibility.
14-16 In/Lbs
The Primary Machine Trijicon RMR to Aimpoint ACRO Adaptor will work with most RMR optic Pockets that do not include ‘Zev Post’ style recoil bosses.
No, the Primary Machine Trijicon RMR to Aimpoint Acro Adaptor would not convert your LEAP mount to accept RMR footprints. I would just recommend using a dedicated RMR picatinny mount like the Scalarworks Trijicon LEAP/RMR Mount, found by using the link below:
https://www.opticsplanet.com/scalarworks-trijicon-leap-rmr-mount.html
Yes, the correct Primary Machine Trijicon RMR to Aimpoint Acro Adaptor for your MR920 would be MPN:RMR/ACRO150/BA (0.15"). This will fit to your slides optic cut and convert it to use optics with the Aimpoint Acro footprint.
Yes. The Primary Machine Trijicon RMR to Aimpoint Acro Adaptor should fit to anything using an RMR cut, and allow you to covert that mount/slide to the Acro footprint.
Yes. If your Slide has the RMR cut then this adaptor will fit to your slide, and the Acro will fit to the mount.