The GLOCK G21 Gen5 MOS (PA215S203MOS) is a full-size .45 ACP pistol engineered for those who require maximum stopping power and modern adaptability. This US-marked model includes three 13-round magazines, offering expanded firepower in a rugged and reliable Gen5 package.
The pistol features a 4.61″ Glock Marksman Barrel (GMB) for enhanced accuracy, a MOS-cut slide for direct mounting of red dot optics, and standard fixed sights. Gen5 upgrades include front slide serrations, a flared magwell, no finger grooves, and ambidextrous slide stop levers for complete user control and comfort.
Built with Glock’s Safe Action® System, this pistol combines big-bore power with intuitive operation. The nDLC-coated slide and durable polymer frame are ready for harsh environments, while the Picatinny-style rail allows for light or laser integration.
Whether you’re protecting home, on duty, or preparing for backcountry threats, the G21 Gen5 MOS delivers unmatched reliability, capacity, and modularity in the .45 ACP category.
Key Features:
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Caliber: .45 ACP
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Capacity: 13+1
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Barrel Length: 4.61″
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Slide Cut: MOS – Optic Ready
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Sights: Fixed
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Frame Material: Polymer
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Slide Material: Steel with nDLC finish
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Frame Marking: “US” (United States model)
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Accessory Rail: Picatinny-style
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Controls: Ambidextrous slide stop, reversible mag release
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Trigger System: Glock Safe Action®
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Part Number: PA215S203MOS
Manufacturer Specifications:
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Overall Length: 8.07″
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Slide Length: 7.32″
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Height (with magazine): 5.51″
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Width (Overall): 1.34″
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Slide Width: 1.00″
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Weight (unloaded): 29.81 oz
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Weight (loaded): 38.80 oz
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Trigger Pull: ~5.5 lbs
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Trigger Distance: 2.76″
FAQ:
Q: What optics can be mounted on the G21 Gen5 MOS?
A: The MOS-cut slide accepts Glock’s modular optic plates, compatible with red dots like Trijicon RMR, Holosun 507C, and more.
Q: What’s different about the “US” marking?
A: It denotes the U.S.-designated model, often requested for agency contracts; functionally, it is identical to standard models.
Q: Does this model support suppressors or compensators?
A: While not threaded, a threaded barrel can be added aftermarket for suppressor or comp use if desired.
Q: Is the G21 Gen5 ambidextrous?
A: Yes. Features include an ambidextrous slide stop lever and reversible magazine release for left- or right-hand operation.
Q: What’s included in the box?
A: Includes the G21 Gen5 MOS US pistol, three 13-round magazines, MOS adapter plate set, backstrap kit, cleaning tools, and Glock hard case.
Brought to you by Black Bayou Armory.
