The second smaller plate is known as a sealing plate. It is used when mounting an RMR optic to a slide or adapter plate to protect the exposed battery and electronics on the underside of the optic.
Yes. The Trijicon Fits Glock RMR Pistol Mount is compatible with all Glock handguns (with the exception of MOS models). It will replace your rear sight and allow you to mount any optic that uses the Trijicon RMR mounting footprint. It also includes hardware to install your optic.
Yes, it could be used on a Glock 43.
Yes, as long as your Glock 35 is not an MOS model.
No, it will not, the rm44 is designed to mount in the dovetail for the rear sight. Since you have an “MOS” Glock the slide is already cut to except a red dot. It is my understanding that all gen 5 mos Glocks come with 4 numbered mounting plates.
Yes, as long as your optic uses the RMR footprint.
You would just need this adapter.
You do not need additional plates such as this one. You just need the 02 plate.
Yes, this mount will fit that pistol.
Yes, this mount will fit that firearm.