Head to head

Holosun SCS-M-GR for Glock MOS: Specs and Fitment

By Cole Harlan, EditorUpdated Nov 5, 2026How we verifyEditorial standards

This is not a two-gun comparison. It is Holosun’s SCS for Glock MOS, the SCS-M-GR, set against the Glock MOS models Holosun lists for it. The one-line answer from Holosun’s page: it direct-mounts to the listed Glock MOS pistols without an adapter plate. Every figure is copied from Holosun’s product page, checked November 5, 2026. For how red dot footprints differ in general, start with our pistol red dot footprints guide.

At a glance

Spec (Holosun label)	SCS-M-GR
Product name on page	Holosun SCS-M-GR Solar Green Dot for Glock MOS
Reticle	2 MOA Dot & 32 MOA Circle; Selectable Reticle: Yes; Reticle Options: MRS Green
Light source / wavelength	LED / 540nm
Window Size	0.9" × 0.63"
Body Dimensions	1.9" × 1." × 0.95" (printed exactly so, including the “1.”)
Body Weight	1.3 oz
Housing	Titanium (Housing Material: Titanium; Housing Color: Black)
Power	Solar Power: Yes; Battery: Internal Rechargeable; Battery Life: 20,000 Hours; Removable Battery: No
Brightness	Automatic Brightness: Yes; Manual Brightness: No; Brightness Override: Yes; Brightness Setting: Auto / Brightness Override Setting 9
Submersion / vibration	IP67 / 5000G
Adjustment	1 MOA per click; W&E Travel Range ±50 MOA
Fitment	Direct Mount (list below)
In the box	SCS-M-GR; screws included 2x M3x6.5mm; lens cloth; multi-tool; manual; warranty card
Source (checked Nov. 5, 2026)	holosun.com/products/scs-m-gr

Holosun’s page describes the optic as “designed specifically for full-size GLOCK™ MOS pistols, mounting directly to the slide without the need for adapter plates.” The page also describes the optic as designed for full-size Glock MOS pistols while its fitment list includes the G26 Gen5 MOS; we copy both as printed. The page does not print a footprint name for the SCS-M-GR and does not label it enclosed or open, so we do not either. The older SCS path on holosun.com (/index.php/products/pistol-sights/scs/scs-mos.html) returned 404 when we checked, and the SCS-M-GR page above is the current Holosun product page for this optic. Holosun prints a price on the page; we list none.

Holosun’s Direct Mount fitment list

Under Fitment, “Direct Mount,” Holosun lists exactly these Glock models:

G17 Gen4 MOS
G17 Gen5 MOS
G19 Gen4 MOS
G19 Gen5 MOS
G20 Gen5 MOS
G21 Gen5 MOS
G22 Gen5 MOS
G23 Gen5 MOS
G26 Gen5 MOS
G34 Gen4 MOS
G34 Gen5 MOS
G35 Gen4 MOS
G40 Gen4 MOS
G41 Gen4 MOS
G45 MOS
G47 MOS

We add no models and no dimensions of our own. Glock’s own statement on its MOS plate, as recorded in our footprints guide, is that standard MOS models come with “a single MOS adapter plate” that fits “Trijicon®, Ameriglo®, and Holosun® (except 509).” Holosun says the SCS-M-GR mounts without adapter plates. We do not reconcile the two; confirm your exact slide with Holosun and Glock before you buy.

Which to pick (on paper)

If you shoot one of the listed Glock MOS models: Holosun lists it under Direct Mount and says no adapter plate is needed.
If you want a sealed, rechargeable optic: Holosun prints an internal rechargeable battery (not removable), solar power, 20,000 hours of battery life and IP67.
If you want a choice of reticles: Holosun prints a selectable 2 MOA dot, 32 MOA circle or circle-dot (MRS Green).
If your pistol is not on the list above: Holosun does not list it here. See the footprints guide for the footprints makers state and enclosed vs open emitter red dots for the design trade-offs.

We have not range-tested this optic; facts above are from Holosun.

Not yet verified

The footprint name for the SCS-M-GR, and whether it is enclosed or open: Holosun’s page prints neither.
Fit on slides not in Holosun’s list, including Gen6 and Slimline MOS models.
How Holosun’s “no adapter plate” wording lines up with Glock’s MOS plate wording (see above).
Prices are not shown.

Frequently asked questions

Does the Holosun SCS-M-GR need an adapter plate on a Glock MOS?

Holosun's page says the SCS-M-GR is designed for full-size Glock MOS pistols, "mounting directly to the slide without the need for adapter plates," and lists Direct Mount fitment for 16 Glock MOS models. Check your exact slide with Holosun and Glock.

What size is the Holosun SCS-M-GR?

Holosun lists a 0.9" x 0.63" window, body dimensions printed as 1.9" x 1." x 0.95", and a 1.3 oz body weight.

Is the Holosun SCS-M-GR waterproof?

Holosun lists an IP67 submersion rating and 5000G vibration on the SCS-M-GR page.

Sources

Holosun: SCS-M-GR specifications and fitment (checked Nov. 5, 2026)