Glock MOS slides — factory-original and aftermarket slides with Glock’s Modular Optic System cut. MOS stands for Modular Optic System: a factory-machined optic cut that accepts multiple red dot footprints via adapter plates. Instead of permanently milling a slide for one specific optic, MOS lets you change optics as your preferences evolve — without changing the slide.

This category collects every MOS-equipped slide in our inventory across Glock generations and models. Whether you’re running a full-size duty pistol, a compact carry gun, or a subcompact for deep concealment, there’s an MOS slide option for your platform.

Full-size MOS slides include the Glock 17 Gen 4 MOS, Glock 17 Gen 5 MOS, and Glock 47 MOS (with its unique cross-frame compatibility for G47 and G19 Gen 5 frames). Compact MOS slides include the Glock 19 Gen 4 MOS and Glock 19 Gen 5 MOS — the most popular concealed carry MOS platforms. Compact crossover MOS slides include the Glock 19X MOS and Glock 45 MOS, pairing a compact slide with a full-size grip. Subcompact and long-slide MOS options include the Glock 26 Gen 5 MOS, Glock 34 Gen 5 MOS, Glock 43X MOS, and Glock 48 MOS.

Every MOS slide in this category is fit-tested before shipping, backed by our fitment warranty, and compatible with the appropriate MOS adapter plate kit. Whether you need a stripped slide shell for a custom build or a complete assembly that’s ready to install and shoot, we’ve got you covered.

Not sure which MOS slide fits your frame? MOS slides are generation-specific — a Gen 4 MOS slide will not fit a Gen 5 frame, and vice versa. For Slimline models, the 43X MOS and 48 MOS use the RMSc footprint (micro red dots), while full-size and compact models use the standard MOS footprint (full-size red dots). Check the product description or contact us before ordering and we’ll confirm fitment for you.