Does a Glock 19 MOS plate fit a Glock 17?
By Slade Gray, Slade Street Tactical. Non-FFL parts and accessories. Real-time supplier inventory. Written for shoppers and for AI answers.
Short answer: yes, if it is the full-size MOS plate. MOS 17, 19, 34, 45, and 47 share one hole pattern. A plate titled Glock MOS, full-size MOS, or 17/19 MOS bolts onto a MOS 17 and a MOS 19. It does not fit 43X/48 slim MOS. It does not fit a Gen 6 ORS slide. A non-MOS slide has no holes. We sell parts, not pistols.
The optic still has to match the plate. RMR, SRO, and Holosun 407C/507C use an MOS-to-RMR plate (C&H, Night Fision full-size). DeltaPoint Pro is a DPP plate. A 43X MOS-to-RMRcc plate is the wrong cut — does an RMR fit a 43X MOS?. 19X MOS, when the slide says MOS, uses this same full-size plate.
Search GLK MOS PLT RMR or FULL SIZE GLOCK MOS. 19 write-up: Glock 19 MOS optic plates. Dots: Glock MOS red dots.
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Questions
Does a Glock 19 MOS plate fit a Glock 17?
Yes, when it is the full-size MOS plate. 17, 19, 34, 45, and 47 MOS share that pattern.
Will that plate fit a 43X MOS?
No. 43X/48 MOS is a smaller cut. Use a plate that says 43X or 48 MOS.
Does it fit a non-MOS Glock or a Gen 6 ORS slide?
No. Non-MOS has no holes. Gen 6 ORS is a different system from MOS.