This mount is meant for Trijicon RMR and SRO red dots and red dots that match the Trijicon RMR footprint.
The Leapers UTG Super Slim RMR Mount will fit a Glock 48, however, the plate will overhang on each side of your slide because it is designed for full size Glock slides and the Trijicon RMR, which itself is wider than the Glock 48 slide.
The Leapers UTG Super Slim RMR Mount for Glock Rear Sight Dovetail will work for mounting a Holosun 508T to a Glock.
The Osprey RMR-OSP-COMP sight uses the Shield RMSc footprint. To mount that sight to a Glock 26 you will need the dovetail mounting plate at the link below.
https://www.opticsplanet.com/evolution-gun-works-leupold-deltapoint-pro-sight-mount-for-glocks.html
Yes, the Leapers UTG Super Slim RMR Mount will fit in the rear sight dovetail cut on your Glock 19 and allow you to mount an RMR pattern optic.
The Leapers UTG Super Slim RMR Mount for Glock Rear Sight Dovetail will fit your Glock 42. However, the mount itself is wider than your slide and will overhang slightly. This will be the same for any mount that fits full size optics.
Yes, this is meant for RMR footprint. Should fit fine on a G26
No. This Leapers UTG Super Slim RMR Mount for Glock Rear Sight Dovetail will only fit Glock handguns and not Canik's.
No, the XRS-100 does not have a compatible mounting footprint.
Here are the specs provided by Leapers:
Material: Aluminum
Weight: 0.43 oz
Length: 1.78 inch
Width: 1.10 inch
Height: 0.28 inch