UMAREX Glock 45 Gen5 MOS GBB Airsoft Pistol — Black

The Glock 45 Gen5 MOS is a gas blowback (GBB) airsoft replica manufactured by Umarex with GHK internal components. It faithfully reproduces the fifth-generation Glock 45 in the MOS (Modular Optic System) variant, featuring a polymer frame, metal slide with Glock markings, and dimensions close enough to the real firearm to be compatible with standard holsters designed for that size category.

The gas-powered blowback system replicates the real operating cycle: with each BB fired, the slide travels rearward, ejects the dummy case, and chambers the next round. The trigger mechanism has been redesigned compared to the previous generation for a smoother action, and the hop-up chamber has been updated with tool-free quick adjustment. For those looking to push ballistic performance further, a CNC 4UAD hop-up chamber is available as an optional upgrade. The pistol is compatible with GHK Glock 17 Gen3 magazines, including CO2 variants, and the internals are dimensioned for use with high-pressure gas.

The MOS version adds a milled opening and mounting interface on the frame for attaching a micro red dot. The slot comes with a pre-installed cover plate as standard: mounting a optic requires the Umarex MOS adapter set 3, sold separately. This gives full flexibility for those who want to run an optic, but shooters who intend to use iron sights only gain no practical advantage from the MOS version over the standard variant. Gen5 improvements over the Gen4 include fully ambidextrous controls (reversible slide stop and magazine release), a front slide bevel similar to the G26, removal of front frame serrations, and a new surface finish.

Key features

• Metal slide blowback with Glock markings: realistic operating cycle and a weight balance close to the real firearm.
• Compatible with standard Glock 45 category holsters: drops straight into existing kit.
• Gen5 tool-free quick-adjust hop-up chamber, with the option to upgrade to the CNC 4UAD version for optimised BB trajectory.
• MOS mounting platform for micro red dot: the interface is integrated directly into the frame, with no additional machining required.
• Fully ambidextrous controls: reversible magazine release and bilateral slide stop, useful for left-handed shooters and degraded-conditions training alike.
• Compatible with GHK Glock 17 Gen3 magazines including CO2 variants: gas choice can be matched to temperature and operating conditions.

In the box

• Glock 45 Gen5 MOS GBB replica
• Pre-installed MOS cover plate