I looked at the Shield Sight YouTube channel for installation instructions, but only saw a video for Glock MOS which looked different than the new 43X MOS. The RMSc box comes with a 1" shim, but I mounted my RMSc directly to the gun and it looks good. What is the 1" shim for? Also, the RMSc box has four screws in it, two are 8mm long and two are 10mm long. One 8mm and one 10mm seemed to work. However, the Glock MOS card in the box says to use 8mm long screws. Can you clarify what the 1" shim is for and which screws to use mounting a RMSc on a new Glock 43X MOS? Thanks

Note I subsequently received a response from Shield Sights that the shim is for 1911 type guns and is not needed with the 43X MOS. I also used the 8mm length screws as per the Glock MOS card.

This message has been edited. Last edited by: RobertHenley,

From the manual:

quote:

Elevation:
Turning the elevation screw Clockwise will move the dot DOWN,
this will move the shot (group) UP
Turning the elevation screw Anticlockwise will move the dot
UP, this will move the shot (group) DOWN.

The 1 degree shim is provided to give extra range of elevation
across a wide range of firearms (such as the 1911). Should
you feel any resistance from the mechanism whilst zeroing the
elevation please fit the shim between the sight and the mount
with the thickest part at the rear.

So yeah, it's all about elevation adjustment.