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GLOCK G21 GEN 4 .45 ACP
Guns International #: 103307459 Seller's Inventory #: 578338
Category: Glock Pistols - G21 - .45 ACP Pistols
Seller's Information
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Seller: Guns Dot Com
Member Since: 9/8/21
State: Minnesota
Zip: 55337
Country: United States
Phone: (866) 582-4867
Platinum Seller
Number of Active Listings: 43915
Total Number of Listings: 383028
Seller: FFL Dealer
Return Policy: 3 day inspection and return policy on used guns.
CERTIFIED USED GUNS Guns Certified Used Guns may be returned within 3 days after the transfer is complete for any reason for a full refund, minus any fees, shipping costs and a 15% restocking fee. A Guns Certified Used Gun may also be returned within 7 days if it is malfunctioning with proper use. NON-CERTIFIED USED GUNS Non-certified used guns can be returned if there is a mechanical defect that occurs within 3 calendar days of the physical transfer of the firearm to your possession. All other reasons for returns on non-certified used guns are ineligible.
Payment Types Accepted: Discover, Visa, MasterCard, American Express. Financing options also available.
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Description:
Guns Listing ID: 578338
The Glock 21 Gen4 is a full-size, polymer-frame, striker-fired semi-automatic pistol chambered in .45 ACP. It’s the Gen4 update of Glock’s long-standing .45 platform and is generally used for duty, home defense, and range shooting. Gen4 introduced grip modularity and a dual recoil spring system to reduce felt recoil and increase service life.
Key specs (typical / manufacturer-style)
Caliber: .45 ACP
Action: Safe-Action® (striker-fired, three-part passive safety system)
Standard magazine capacity: 13 + 1 (13-round magazine + 1 in the chamber). (Smaller/state-compliant mags and other aftermarket mags are available.)
Barrel length: 4.61 in (˜117 mm)
Overall length: 7.95 in (˜202 mm)
Height: 5.47 in (˜139 mm) with standard magazine inserted
Width: 1.34 in (˜34 mm)
Weight (empty/unloaded): ˜ 26–27 oz (˜740–765 g) — varies slightly by source and whether you include magazine
Weight (with loaded magazine): roughly 31–33 oz (varies by ammo)
Sights: Typically fixed 3-dot (factory) — dovetailed front/rear for aftermarket sight options
OAY
Frame material: Polymer (glass-filled nylon)
Slide material / finish: Steel slide, typically Tenifer or similar hard finish on older models; newer models use Glock’s nDLC finish depending on production year
Trigger pull (factory): ~5.5 lb (approximate typical factory pull)
Rifling: Standard polygonal rifling (Glock’s usual barrel type)
Safety features: Trigger safety, firing pin safety, drop safety (part of Glock Safe-Action system)
Gen4-specific features
Interchangeable backstraps (modular grip): small, medium, large backstraps included to adjust grip circumference
Rough textured frame (RTF) / improved grip texture compared with Gen3
Dual recoil spring assembly (reduced recoil, longer spring life)
Enlarged reversible magazine catch (easier manipulation for left- or right-hand shooters)
Beavertail and improved ergonomics compared with earlier generations
Common variants and notes
You’ll see G21 Gen4 examples in standard service configuration; there are also long-slide or MOS/optic-ready conversions offered by third parties or later Glock product lines.
Magazines from earlier G21 generations are generally compatible; there are also extended and reduced-capacity alternatives for jurisdictions with magazine limits.
Aftermarket parts (sights, triggers, magazines, optics plates, holsters) are widely available.
OAY
Price: $424.99
Manufacturer: GLOCK
Model: G21 GEN 4
Caliber Info: .45 ACP
Condition: Used - Non-Certified
Barrels: 4.5" BARREL
Action: SEMI AUTOMATIC
Finish: black