UMAREX Glock 17 Gen5 MOS GBB Airsoft Pistol — Black

The UMAREX Glock 17 Gen5 MOS is a gas-powered GBB (gas blowback) airsoft replica of the fifth-generation Glock 17 in the MOS (Modular Optic System) configuration, designed for those who want true-to-life dimensions, realistic recoil response, and the ability to mount a red dot directly on the slide. The replica runs on gas and uses GHK internal components rated for high-pressure gas, including CO2.

The metal blowback system reproduces the cycling action on every shot: the slide travels rearward, ejects the imaginary case, and returns to battery, delivering a shooting feel that closely mirrors the real firearm. The trigger mechanism has been redesigned compared to the previous generation for a smoother pull, while the hop-up chamber with quick adjustment lets you correct BB trajectory without disassembling the replica. For those looking to push accuracy further, a CNC 4UAD hop-up chamber is available as an optional accessory. The polymer frame reproduces the Gen5 grip: no front slide serrations, a chamfered front slide profile matching the G26 Gen3/4, and fully ambidextrous controls — reversible slide release and magazine release — meaningful differences from the Gen4 that make the replica directly useful for training with either hand.

The MOS version includes a milled cut on the slide prepared for mounting a micro red dot via a dedicated adapter plate. The replica ships with the cover plate already installed: to fit an optic, the UMAREX MOS adapter set 3 is required, sold separately. Without it, the slide functions normally with the cover plate in place. Dimensions and weight match the original, making the replica compatible with standard Glock 17 holsters of the same size category. Compatible magazines are GHK Glock 17 Gen3 units, including CO2 variants.

Key points

• GBB system with metal slide and Glock markings: the cycling action is mechanically realistic on every shot.
• Ambidextrous slide release and magazine release in Gen5 configuration: practical for training with either hand.
• Quick-adjust hop-up included, with compatibility for the CNC 4UAD chamber for those wanting to go beyond baseline accuracy.
• MOS slot on the slide: opens the option to mount a micro red dot without additional external adapters, provided you have the UMAREX MOS 3 set.
• Compatible with GHK Glock 17 Gen3 magazines, including CO2 versions, giving access to a well-established magazine pool on the market.
• True-to-original dimensions: the replica fits standard Glock 17 holsters, making existing gear directly usable.

In the box

• Glock 17 Gen5 MOS GBB replica
• Pre-installed MOS cover plate