Compact | 9 mm Luger

GLOCK 45 MOS - Compact Crossover in black with Modular Optic System

The compact crossover pistol G45 MOS in 9x19mm combines a compact slide with a full size frame and has all the benefits of a Gen5 model. The slide in MOS Configuration makes it easy to mount a miniature reflex sight on the pistol’s slide without the need for a new slide or separate mounting system. Utilizing the design and engineering GLOCK developed for its military pistol (G19X), combined with Operator and worldwide Law Enforcement specifications.

The slide has the proven, superior GLOCK hard-surface nDLC finish in non-reflective black. It comes with front serrations (FS) which provide an additional tactile surface choice when manipulating the slide giving the operator positive traction even with wet or sweaty hand. The frame is also subdued black, with a flared magazine well for fast reloads in critical situations. Additional features include the smoother trigger pull, the enhanced texture for sure handling, a reversible magazine catch, ambidextrous slide stop lever, the Modular Beavertail Backstrap System (MBS) for individual ajustability and the incredibly accurate, reliable GLOCK Marksman Barrel (GMB).

With the G45 MOS GLOCK has the next level of performance for service pistols - tested, proven and unmatched by any others.
GLOCK G45 MOS - modular optic system
*optic not included

Modular optic system - MOS

The modular optic system (MOS) configuration offers the possibility to simplify the mounting of popular optical sights. 

Learn more about the Modular Optic System
GLOCK G45 MOS - front serrations

Front serrations (FS)

Front serrations provide a different look and an additional tactile surface.
GLOCK G45 MOS - nDLC coating
symbolic image

nDLC finish

GLOCK's nDLC finish provides tougher, more durable protection than previously used finish. The nDLC finish increases protection against corrosion and scratching and improves the ability of the pistol to function in adverse conditions. 
GLOCK G45 MOS - slide stop lever
symbolic image

Ambidextrous slide stop lever

The ambidextrous slide stop lever makes it easier for gun owners to quickly, safely and comfortably manipulate the slide whether they are left-handed or right-handed. 
GLOCK G45 MOS - GLOCK marksman barrel

GLOCK Marksman barrel

The GLOCK Marksman barrel (GMB) features enhanced barrel rifling based on the proven polygonal barrel design which delivers improved accuracy.
GLOCK G45 MOS - finger grooves

Versatility by removal of the finger grooves

Comfortable grip to a wider range of consumers, regardless of their hand size. 
GLOCK G45 MOS - safe action system

Safe Action® System

Three safeties disengage sequentially as the trigger is pulled and automatically reengage when the trigger is released. 

Learn more about the Safe Action® System
GLOCK G45 MOS - reversible magazine catch

Reversible magazine catch

The magazine catch of the Gen5 frame is reversible and enlarged towards the rear of the pistol. The reversible magazine catch is more user friendly to the shooter's reach and allows them to switch the catch to the left or right side of the pistol. 
GLOCK G45 MOS - flared mag-well

Flared magwell for speedloading

The larger opening of the flared magwell makes it easier to funnel the magazine into the magwell, particularly in high-stress situations where fractions of seconds matter.
GLOCK G45 MOS Beavertail Backstraps

Customizable frame size

The G45 comes with beavertail backstraps in two different sizes. The backstrap frame allows the users to change the circumference of the grip to fit their individual hand size. 
GLOCK G45 MOS - high magazine capacity

Magazine capacity

The G45 comes with two standard (17rds) magazines. Extended (17+2 rds) and other high capacity magazines are available.

Note: some magazines might not be available in all countries due to legal regulations.
GLOCK G45 MOS - mounting rail

Mounting rail

Mounting rails in front of the trigger guard allow mounting accessories such as tactical lights and lasers.
GLOCK G45 MOS - loaded chamber indicator
symbolic image

Loaded chamber indicator

Visible and palpable indicator as part of the extractor to show whether there is a cartridge in the chamber.

9 mm Luger


Safe Action®

Mag. Capacity


Optional: 19 / 24 / 31 / 33 / 17

Barrel Length

102 mm | 4.02 inch


without magazine

616 g | 21.73 oz


with empty magazine

695 g | 24.52 oz


with loaded magazine**

860 g | 30.34 oz

Trigger Pull***

26 N

1 LENGTH (OVERALL)* 189 mm | 7.44 inch
2 SLIDE LENGTH 174 mm | 6.85 inch
3 WIDTH (OVERALL) 34 mm | 1.34 inch
4 SLIDE WIDTH 25,5 mm | 1.0 inch
5 HEIGHT INCL. MAG. 139 mm | 5.47 inch
6 Sight Radius POLYMER 157 mm | 6.18 inch
Sight Radius STEEL 156 mm | 6.14 inch
Sight Radius GNS 155 mm | 6.10 inch
7 TRIGGER DISTANCE* 70 mm | 2.76 inch

* FOR GEN4/GEN5 MODELS and G44: Check out the Gen5, Gen4 and G44 technology pages for medium/large beavertail backstraps (G19X and G45 see below).
Technical Data are rounded and do not reflect tolerances – they may be altered without notice! Subject to technical changes.
Dimensions of GLOCK pistol G45 MOS

Customize your frame size

The G45 MOS allows the user to change the circumference of the grip to fit the individual hand size and comes with beavertail backstraps in two sizes.

The beavertail backstraps are easily changed and secured to the frame with a single pin offering the following options: a short frame (SF) version, a medium (M) and a large (L) version.

The beavertail backstraps keep large hands clear of the slide and offer more comfortability.

The short frame (SF) version without any beavertail backstrap mounted still remains a complete fully functional frame. Its dimensions are smaller than the G17 frame of previous generations.

G45 Illustration Beavertail Backstraps
G17 Gen5 Pistol Set

The black crossover MOS package*

  • G45 MOS pistol
  • Two G45 standard magazines (17 rds)
  • Polymer rear and front sights
  • Set of beavertail backstraps (M/L)
  • MOS Adapter set
  • Pistol case
  • Speed loader (black)
  • Cleaning kit
  • Instructions for use

The G45 MOS is also available as G45 - the crossover pistol in standard configuration
*Scope of supply might vary depending on distributing country.
G17 Gen5 MOS Accessories