The Trijicon RMR Type 2 3.25 MOA Adjustable Red Dot Sight will mount to a Glock 45 MOS. Glock MOS Plate #02 will allow you to mount the Trijicon RMR Type 2 3.25 MOA Adjustable Red Dot Sight to a Glock 45 MOS. You won't need anything else.
The Trijicon RM01 RMR Type 2 LED 3.25 MOA Red Dot Sight will not fit your P320 as your P320 uses a Deltapoint Pro optic cut, not an RMR cut. You would be able to fit optics like the Leupold DeltaPoint Pro, Eotech EFLX, Sig Sauer Romeo 1 Pro, Sig Sauer Romeo Zero Pro, and Sig Sauer Romeo 2.
The Trijicon RMR Type 2 would not mount directly to the P320 xcarry Legion. It has the DeltaPoint Pro footprint. If you wanted to mount the RMR, you would need an adaptor that can change your P320 to a standard RMR footprint.
No, the Trijicon RMR does not fit the Hellcat OSP. We have no information as to whether or not Trijicon is developing a red dot that is compatible, but it is not likely.
Yes, the RMR should have firm/audible clicks when adjusting the windage/elevation.
Yes, you can, but it would require that the slide of your STI be milled for a red dot OR you would need some sort of adapter to replace the rear sight that would accept a red dot. Please email us at techsales@opticsplanet.com and we can provide some options for you.
Yes, but you will the correct mounting plate.
Yes, the Glock 43 has the same sight cut as the other Glock pistols, so you can use this adapter plate: https://www.opticsplanet.com/trijicon-glock-rmr-pistol-mount.html however the adapter plate and optic will most likely be wider than the slide on your 43.
The Trijicon RMR Type 2 RM01 LED 1x65mm 3.25 MOA Red Dot Sight is not compatible with the Springfield Hellcat or Hellcat OSP. However, if you have the Hellcat OSP model, you can purchase the Evolution Gun Works Trijicon RMR Sight Mount which will fir to the optic ready slide and allow you to install this optic. The EGW adapter plate can be found linked below:
https://www.opticsplanet.com/evolution-gun-works-trijicon-rmr-sight-for-springfield-hellcat-optics-ready.html