Glock PA455S203 45 Gen 5 9mm 4.02" Pistol, 17-Round, 3 Mags

Glock PA455S203 45 Gen 5 9mm 4.02" Pistol, 17-Round, 3 Mags

The Glock 45 Gen 5 PA455S203 is a 9mm crossover pistol that combines a compact-length slide with a full-size Gen 5 frame. That configuration gives the G45 a 4.02-inch Glock Marksman Barrel and shorter upper assembly while retaining the longer grip and standard 17-round magazine capacity associated with Glock's full-size 9mm format.

The crossover layout is the defining feature of the Glock 45. Rather than matching the proportions of a Glock 17 or Glock 19 exactly, the G45 uses a compact-length slide over a full-size frame, creating its own balance of slide length, grip size, and magazine capacity within Glock's 9mm lineup.

This PA455S203 configuration also includes Glock Gen 5 features such as a flared magazine well, reversible magazine catch, ambidextrous slide stop lever, Modular Backstrap System, front slide serrations, and a black nDLC-finished slide. The pistol is supplied with fixed sights and three 17-round magazines.

Compact-Length Slide with Full-Size Frame

The Glock 45 uses a compact-length slide paired with a full-size Gen 5 frame. Glock developed the G45 around this crossover configuration rather than simply following the dimensions of one of its established compact or full-size models.

The full-size frame provides the longer gripping surface and standard 17-round magazine format, while the shorter slide and 4.02-inch barrel keep the upper assembly more compact than a Glock 17-length configuration.

4.02-Inch Glock Marksman Barrel

The PA455S203 uses a 4.02-inch Glock Marksman Barrel. The Glock Marksman Barrel is one of the defining Gen 5 mechanical features and is paired here with the compact-length G45 slide assembly.

The barrel length helps establish the G45's compact upper dimensions while the full-size frame below it preserves the larger grip and magazine capacity.

Gen 5 Frame and Control Layout

The G45 Gen 5 frame incorporates Glock's Modular Backstrap System, allowing the grip configuration to be adjusted with interchangeable backstraps.

The pistol also uses an ambidextrous slide stop lever and a reversible magazine catch. Together, those controls allow the G45 to be configured and operated more naturally by a wider range of shooters without requiring aftermarket control changes.

Flared Magazine Well

The bottom of the grip incorporates a flared magazine well that widens the magazine entry point.

This helps guide the magazine into the frame during insertion and is integrated directly into the Gen 5 frame design rather than added as a separate component.

Front Slide Serrations

Front slide serrations provide an additional gripping surface ahead of the ejection port. They supplement the rear serrations and give the shooter another location for manual slide manipulation.

Black nDLC Slide Finish

The slide uses Glock's black nDLC finish. This non-reflective surface treatment is part of the Gen 5 configuration and provides the dark factory finish specified for the G45.

17-Round Capacity with Three Magazines

The full-size G45 frame uses Glock's standard 17-round 9mm magazine capacity despite the pistol's compact-length slide.

This PA455S203 package includes three 17-round magazines, making the magazine package part of the exact factory configuration rather than a general G45 assumption.

Key Features

• Glock 45 Gen 5 crossover configuration
• 9mm chambering
• Compact-length slide with full-size Gen 5 frame
• 4.02-inch Glock Marksman Barrel
• Glock Safe Action system
• Black nDLC slide finish
• Flared magazine well
• Ambidextrous slide stop lever
• Reversible magazine catch
• Modular Backstrap System
• Front and rear slide serrations
• Fixed sights
• 17-round standard capacity
• Three magazines included

Specifications

• Manufacturer: Glock
• Model: G45 Gen 5
• MPN: PA455S203
• UPC: 764503030895
• Caliber: 9x19mm
• Action: Semi-Automatic
• Operating System: Glock Safe Action
• Frame: Full-Size Polymer
• Slide Configuration: Compact Length
• Barrel: Glock Marksman Barrel
• Barrel Length: 4.02"
• Slide Finish: Black nDLC
• Sights: Fixed
• Magazine Capacity: 17 Rounds
• Magazines Included: 3
• Overall Length: 7.44"
• Overall Width: 1.34"
• Height with Magazine: 5.47"

The Glock 45 Gen 5 Crossover Configuration

The Glock 45 Gen 5 is defined by the relationship between its compact-length upper and full-size frame. The shorter slide and 4.02-inch Glock Marksman Barrel establish the upper dimensions, while the longer grip provides the full-size 17-round magazine format.

Gen 5 features including the ambidextrous slide stop, reversible magazine catch, flared magwell, Modular Backstrap System, front serrations, and black nDLC slide complete the configuration. For buyers comparing Glock 9mm pistols, those dimensions and controls are the features that distinguish the G45 from both compact and traditional full-size models.

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