Finding a full-size, reliable semi-auto for duty, home defense, or serious range work means balancing accuracy, ergonomics, and optics readiness. Expert shooters and professionals often choose pistols that blend proven safety systems with modern features that improve shot-to-shot performance and handling.
GLOCK 21 Gen 5 MOS delivers improved accuracy, light recoil and the option to install an optic. 
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Key features and what they mean on the range
The Gen5 platform emphasizes shot-to-shot consistency. The Glock Marksman Barrel (GMB) adds more aggressive polygonal rifling and a target-style crown, improving muzzle seal and reducing bullet yaw. Paired with tighter chamber specs, expect improved group sizes and repeatable point of impact compared with older generations.
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Optics-ready MOS slide
MOS features a precision-machined slide that accepts popular miniature red dots with multiple adapter plates (sold separately). This makes mounting an optic straightforward and keeps the pistol a viable competition or defensive platform without permanent slide modification. View product details and pricing
Ergonomics and controls
Gen5 updates include ambidextrous slide stop levers for left-hand or support-hand manipulation, removal of finger grooves for a more natural grip, and multiple backstraps (two sizes) with a beavertail to customize frame circumference to hand size. The flared mag-well with a larger funnel and enlarged floor plate speeds reloads under stress or at the timer.
Safety, recoil and practical considerations
The Safe Action System provides familiar three-tier passive safeties that disengage sequentially as the trigger is pressed and automatically re-engage when released. Combined with the slightly reduced perceived recoil of the Gen5 ergonomics and the barrel’s performance, the pistol is easy to train with for new shooters yet precise enough for experienced operators. Priced at $630.99, this refurb option represents value for an optic-ready, full-size platform.
For professionals and serious shooters seeking a durable, accurate full-size semi-auto with optics capability and modern ergonomics, the GLOCK 21 Gen 5 MOS REFURBISH is a compelling choice. Check current availability and purchase options on our shop page — clicking will take you to the product listing where you can complete a purchase through the retailer. Check current availability
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People Also Ask
What makes this product stand out from competitors?
This product offers superior quality and innovative features that set it apart in the market. Its design focuses on both performance and reliability, making it a top choice for professionals and enthusiasts alike.
Is this product suitable for beginners?
Yes, this product is designed with user-friendly features that make it accessible to beginners while still offering advanced capabilities for experienced users.
What warranty or support is available?
The product comes with comprehensive warranty coverage and excellent customer support to ensure your satisfaction and peace of mind.
How does this compare to similar products in its price range?
This product offers exceptional value for its price point, providing features and quality that typically cost significantly more in comparable alternatives.
What maintenance is required?
Minimal maintenance is required thanks to the product’s durable construction and quality materials. Regular cleaning and occasional inspections will keep it performing optimally.
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