The Glock 21 MOS is optics-ready via a plate system, so it fits several footprints depending on which adapter plate you use. Here’s how it works.
How the Glock 21 MOS mounts an optic
- Brand
- Glock
- Optic system
- Glock MOS (plate-based)
The Glock 21 MOS uses the Glock MOS plate system — it ships with adapter plates, so you pick the plate that matches your optic’s footprint.
Plates & footprints for the Glock 21 MOS
| Slide cut / system | Adapter | Fits | |
|---|---|---|---|
| Glock MOS | Glock MOS Plate — DeltaPoint Pro footprint | Glock MOS models (Gen4 / Gen5) | |
| Glock MOS | Glock MOS Plate — Docter / Venom footprint | Glock MOS models (Gen4 / Gen5) | |
| Glock MOS | Glock MOS Plate — RMR footprint | Glock MOS models (Gen4 / Gen5) | |
| Glock MOS | Glock MOS Plate — RMSc footprint | Glock MOS models (Gen4 / Gen5) |