How to mount a Shield SMS2 Glass Edition on a Picatinny rail: it is a Shield RMS open-emitter reflex, so it takes a Shield RMS-footprint Picatinny mount. Which mount to buy and the height to pick.

Updated 05 September 2026.

Scope Mount Finder / Every rail, tube and red-dot footprint

Fit a Shield SMS2 Glass Edition on a Picatinny rail

Name: Fit a Shield SMS2 Glass Edition on a Picatinny rail: published specification
Creator: Scope Mount Finder
License: https://creativecommons.org/licenses/by/4.0/

The Shield SMS2 Glass Edition is a Shield RMS optic. Here is the mount that puts it on a Picatinny rail and the footprint it must match.

Direct fitThe Shield SMS2 Glass Edition is a Shield RMS open-emitter reflex, so it mounts on a Picatinny rail through a Shield RMS-footprint mount. Buy the Shield RMS-footprint Picatinny mount, not a mount cut for any other footprint.

OpticShield SMS2 Glass EditionShield RMS

interface

MountShield RMS-footprint Picatinny mount

seats on

RailPicatinny rail (MIL-STD-1913)5.23 mm slot, 10.01 mm pitch

Fit readoutBench figures

Fitment

Optic type

open-emitter reflex

Note

the Shield RMS uses the RMS (not RMSc) hole spacing; match the mount to RMS

Mount the Shield SMS2 Glass Edition

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The Shield SMS2 Glass Edition is cut to the Shield RMS footprint. To put it on a Picatinny rail you fit a Shield RMS-footprint Picatinny mount: the mount carries the Shield RMS pattern on its top and clamps the rail below, so the sight screws down to the pattern it was made for.

A mount cut for a different footprint will not take the Shield SMS2 Glass Edition. Match the mount to the Shield RMS pattern, and pick the mount height for the cowitness or heads-up hold you want on the rifle or carbine.

Related fitments

›Shield SMS2 Glass Edition footprint and mountthe optic
›Shield RMS footprintthe pattern
›How this footprint reaches a railthe general fit
›Picatinny rail (MIL-STD-1913)the base

Questions and answers

Fit a Shield SMS2 Glass Edition on a Picatinny rail?

The Shield SMS2 Glass Edition is a Shield RMS open-emitter reflex, so it mounts on a Picatinny rail through a Shield RMS-footprint mount. Buy the Shield RMS-footprint Picatinny mount, not a mount cut for any other footprint.