The GLOCK 21 Gen4 Rebuilt brings the proven power and durability of the .45 ACP to a full-size platform with modern Gen4 ergonomics and a reinforced recoil system. Rebuilt to factory-spec performance, this model retains the classic GLOCK Safe Action system while adding Gen4 upgrades such as interchangeable backstraps, a dual recoil spring assembly, and rough textured frame treatment. Supplied with three 13-round magazines and an OEM rail, this rebuilt G21 is configured for reliable service and long-term durability.
Key Benefits
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Proven Stopping Power: .45 ACP chambering delivers heavy-hitting performance in a full-size frame.
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Improved Durability & Longevity: Dual recoil spring assembly reduces wear on the slide and frame for extended service life.
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Customizable Fit & Control: Interchangeable backstraps and Gen4 textured frame allow for a secure, repeatable grip.
Key Features
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Gen4 Modular Backstrap System: Quickly change grip circumference to match different hand sizes.
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Dual Recoil Spring Assembly: Reduces felt recoil and extends component life compared with single-spring designs.
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Three 13-Round Magazines + OEM Rail: Includes three factory 13-round magazines and a Glock OEM accessory rail for lights/lasers.
Specifications
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Manufacturer: Glock
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Model: G21 (Gen4 Rebuilt)
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Item: 133775
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SKU: PR21501
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UPC: 764503992117
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Caliber: .45 ACP
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Action: DAO / Safe Action
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Barrel Length: 4.61 inches
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Overall Length: 8.07 inches
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Height: 5.50 in (approx; see item dimensions)
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Weight: 38.30 oz
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Capacity: 13 + 1 (three 13-round magazines included)
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Finish / Color: Matte / Gas Nitride slide; Black polymer frame
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Frame Material: Polymer with Gen4 rough textured treatment
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Grips: Black interchangeable backstraps
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Sights: Fixed night sights
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Safety: Trigger, firing pin, drop safeties (Glock Safe Action)
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Slide Description: Black steel (gas nitride finish)
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Accessories Included: 3 magazines, Glock OEM rail
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Condition: Rebuilt (Gen 4 Rebuilt series)
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