The Glock 21 offers you a full-size .45 ACP semi-automatic pistol featuring Glock’s proven Safe Action System and a 13-round double-stack magazine capacity. You’ll find the polymer frame weighs 745g unloaded, while the 117mm barrel delivers consistent 3-inch groups at 25 yards. It’s available in standard Gen4, MOS (Modular Optic System), and SF variants, with prices ranging from $400-$800 depending on configuration. The platform’s evolution since 1990 reveals impressive engineering depths.
Key Takeaways
- The Glock 21 is a full-size .45 ACP semi-automatic pistol featuring a polymer frame and 13-round double-stack magazine capacity.
- Equipped with Glock’s Safe Action System and modular backstrap, offering reliable operation and customizable grip dimensions for different hand sizes.
- Typical pricing ranges from $500-$650 for new standard models, with pre-owned variants available between $400-$550.
- Delivers consistent 3-inch groups at 25 yards and maintains optimal functionality with minimal maintenance requirements.
- First introduced in 1990, designed to meet U.S. military specifications and widely adopted by law enforcement and civilian shooters.
Description
The Glock 21 represents a full-size semi-automatic pistol chambered in .45 ACP, featuring a double-stack magazine with 13-round capacity.
You’ll find its polymer frame houses Glock’s Safe Action System, while the modular backstrap lets you customize grip dimensions. The pistol measures 205mm in overall length with a 117mm barrel, delivering light recoil despite its .45 caliber power. At 740g unloaded, it balances maneuverability with magazine capacity.
Price Range
Standard pricing for a new Glock 21 falls between $500-$650, with variations based on generation model and selected features. You’ll find GEN4/GEN5 MODELS commanding higher prices due to enhanced Gen4 Technology area improvements. Pre-owned GLOCK 21 Gen variants typically retail for $400-$550.
| Model Type | Price Range | Features |
|---|---|---|
| Standard Gen4 | $500-$650 | Basic Configuration |
| Pre-owned | $400-$550 | Variable Condition |
| Limited Edition | $600-$800 | Special Finishes |
| OD Green Variant | $650-$800 | Custom Coating |
| Online/Show Price | $450-$600 | Competitive Rates |
Specifications
You’ll find the Glock 21 chambered in .45 ACP with polymer frame construction that keeps weight to 745g unloaded. The pistol features a 117mm barrel length optimized for the .45 ACP cartridge while maintaining Glock’s Safe Action system. Standard magazine capacity gives you 13 rounds, with 10-round magazines available for restricted jurisdictions.
| Specification | Value |
|---|---|
| Weight | 745g (unloaded) |
| Barrel Length | 117mm |
| Material | Polymer frame |
| Chambering | .45 ACP |
| Capacity | 13 rounds (standard) |
Weight
When comparing weight specifications across Glock 21 variants, you’ll find subtle differences between generations. The standard model weighs 745g (26.28 oz) unloaded without magazine, while the Gen4 version comes in slightly lighter at 740g (26.10 oz).
You’ll notice further weight reduction in the polymer-frame Gen4 model at 735g (25.93 oz). These Technical Data variations reflect Glock’s ongoing design refinements with medium/large backstraps.
Barrel Length
The Glock 21’s barrel length measures precisely 117 mm (4.61 inches), complementing its balanced weight distribution. You’ll find this barrel length provides optimal ballistic performance for the .45 ACP caliber while maintaining practical dimensions for a full-size pistol.
Though slight variations exist between GLOCK generations, the standard G21 barrel length delivers an effective compromise between tactical handling and projectile velocity.
Material Made Out Of
Constructed with a pioneering combination of materials, Glock 21’s frame features a high-impact polymer that drastically reduces overall weight while maintaining structural integrity.
You’ll find steel components strategically integrated throughout, including the nitride-treated slide and precision-engineered barrel with octagonal rifling. The steel magazine securely houses your .45 ACP ammunition, while you can choose between polymer, steel, or GNS sight configurations.
Chambered In
Engineered around the hard-hitting .45 ACP cartridge, the Glock 21 delivers formidable stopping power through its 117mm barrel while maintaining controllable recoil characteristics.
You’ll find the Safe Action semi-automatic system efficiently cycles each round, providing reliable feeding of the large-caliber ammunition. The pistol’s design accommodates both 13-round standard magazines and 10-round variants for restricted jurisdictions.
Capacity
Standard 13-round magazines serve as the primary feeding device for the Glock 21, offering substantial ammunition capacity in the .45 ACP platform. You’ll find the standard magazine capacity exceeds many competing .45 ACP handguns on the market.
For jurisdictions with magazine restrictions or users preferring reduced capacity, Glock offers an optional 10-round magazine variant, allowing adaptability to your specific requirements.
Trigger Pull
When examining the Glock 21’s trigger mechanics, you’ll find a deliberate 28 Newton (N) pull weight that enhances operator safety without compromising function. The trigger distance spans 72.5 mm through its travel path, while Glock’s Safe Action system delivers a consistent, creep-free operation.
You’ll notice the intentionally firm trigger pull, engineered to promote positive control during tactical engagements.
Safety?
Three primary safety mechanisms comprise the Glock 21’s Safe Action system, working in concert to prevent unintentional discharge while maintaining combat readiness.
You’ll find an integrated trigger safety that blocks rearward movement unless properly engaged, complemented by a firing pin safety that mechanically prevents forward pin movement.
This Safe Action configuration provides consistent protection while preserving the pistol’s rapid deployment capability.
Action
Operating on Glock’s proven Safe Action system, the G21 delivers a consistent trigger pull weight across its entire stroke, enhancing both accuracy and combat efficiency.
You’ll find the trigger mechanism provides a light, short pull that maintains precision while engaging targets. The Safe Action system integrates three independent safeties that disengage sequentially as you press the trigger, automatically reengaging when released.
Optic Ready?
While the standard Glock 21 doesn’t come optics-ready from the factory, you’ve got multiple options for mounting red dot sights.
You can purchase the Glock 21 MOS directly from the GLOCK Store, which features factory slide milling for optic mounting. Alternatively, you can install aftermarket optic mounts or have your slide professionally milled, though this voids the warranty.
The 28.5mm slide accommodates most compact red dots.
Review
You’ll find the Glock 21’s strengths in its proven reliability across harsh conditions, combat-grade accuracy delivering 3-inch groups at 25 yards, and simplified maintenance with minimal parts.
The pistol’s weaknesses center on its bulky grip dimensions and occasional feeding issues with specific ammunition types, though the G21 SF model addresses grip concerns.
The Safe Action system, 13-round capacity, and compatibility with various accessories make it a versatile .45 ACP platform that excels in both duty and defensive applications.
Pros
When evaluating the Glock 21’s strengths, the pistol’s combination of reliability and stopping power stands at the forefront. You’ll appreciate the Gen5 and Gen4 Technology, featuring a reversible magazine catch that accommodates both left and right-handed shooters. The Safe Action system delivers consistent trigger control while the modular design enhances ergonomic customization.
| Feature | Benefit | Performance |
|---|---|---|
| Polymer Frame | Weight Reduction | Enhanced Mobility |
| 13-Round Capacity | Extended Engagement | Tactical Advantage |
| Safe Action System | Drop Safety | Negligent Discharge Prevention |
| Modular Backstrap | Ergonomic Fit | Improved Shot Control |
| .45 ACP Chamber | Terminal Ballistics | Maximum Stopping Power |
Cons
Despite its robust design, the Glock 21 presents several notable drawbacks that merit consideration before purchase. You’ll face potential exposure to chemicals including lead and reproductive harm. The pistol’s larger grip frame poses challenges for smaller hand size configurations, while overpressure ammunition can compromise structural integrity.
| Limitation | Impact |
|---|---|
| Frame Size | Suboptimal ergonomics for small hands |
| Ammunition Sensitivity | Potential damage from +P loads |
| Balance Dynamics | Shifting weight during fire sequence |
| Accuracy Profile | Combat vs. target precision tradeoff |
Reliability
Renowned for its unwavering performance, the Glock 21 demonstrates exceptional mechanical reliability across diverse operating conditions. You’ll find it maintains optimal functionality even with minimal maintenance, consistently delivering 3-inch groups at 25 yards.
While performance depends on proper magazine and ammunition selection, the pistol’s reliability can be further enhanced through aftermarket upgrades like Trijicon night sights and rail-mounted accessories.
Similar Models
Several variants of the Glock 21 have been developed to meet specific operational requirements. You’ll find the Gen4 model featuring enhanced ergonomics and a dual recoil spring assembly.
The Glock 21SF offers a reduced frame size, while maintaining .45 Auto caliber functionality.
At the GLOCK Store for Gun enthusiasts, you’ll also discover the Competition model with an extended barrel and adjustable sights.
Similar Models From Other Manufacturers
Major firearm manufacturers offer compelling .45 ACP alternatives to the Glock 21, each with distinct engineering approaches. You’ll find the polymer-framed Springfield XD(M) and Smith & Wesson M&P45 providing similar capacities, while the CZ-97B offers all-steel construction.
The Sig P220 delivers comparable performance, and Ruger’s SR1911 presents a classic 1911 platform. As with all firearms sold in California, these models carry required safety warnings about birth defects and cancer risks.
Maintenance
Basic field stripping and minimal cleaning are the core maintenance requirements for the Glock 21’s reliable operation. While lubrication isn’t essential, applying light gun oil helps prevent corrosion and ensures smooth cycling.
You’ll need to perform regular inspections of critical components like the trigger mechanism, ejector, and extractor. The pistol’s barrel can be replaced without gunsmithing if wear occurs, and proper storage prevents polymer frame degradation.
History
The Glock 21’s development in 1990 marked the manufacturer’s first venture into the .45 ACP caliber market. Designed to meet United States military specifications for a service sidearm, the pistol quickly garnered attention from law enforcement agencies and civilian shooters due to its high-capacity magazine and robust reliability.
Through multiple generational iterations, Glock has enhanced the platform’s ergonomics, sight systems, and operational characteristics.
Frequently Asked Questions
Is It Illegal to Have a Glock 21?
You can legally own a Glock 21 if you meet federal and state legal ownership requirements. You must pass background checks, obtain necessary permits, and follow state-specific regulations.
Always verify current laws in your jurisdiction before purchasing or possessing this firearm.
You’ll need to comply with your local concealed carry laws and magazine capacity restrictions where applicable. The firearm itself is a commercially available .45 ACP caliber semi-automatic pistol.
Is the Glock 21 a Good Gun?
You’ll find this .45 ACP pistol offers excellent reliability with consistent feeding and ejection. The Safe Action trigger system delivers a smooth 5.5 lb pull weight with minimal overtravel, enhancing your accuracy potential.
You’re getting combat-accurate performance with 3-inch groupings at 25 yards, and the polymer frame reduces felt recoil. The quick reset and positive trigger break let you maintain target acquisition through follow-up shots.
What Caliber Is a Glock G21?
Picture yourself gripping a robust pistol as the .45 ACP round delivers its signature punch. Your Glock 21 is chambered in this powerful caliber, allowing you to pack 13 rounds in the standard magazine capacity.
You’ll notice the distinct recoil management characteristics of the .45 ACP round, which can affect your sight picture during rapid fire. The large-frame design helps tame the substantial ballistic energy of this proven defensive cartridge.
Is the Glock 21 Discontinued?
No, the Glock 21 isn’t discontinued – it’s still actively manufactured and widely available. You can purchase one through licensed dealers, though you’ll need to comply with your local firearm ownership requirements and handgun permit laws.
The G21 continues to be produced in various generations, with standard and extended magazine capacity options (subject to state restrictions). As one of Glock’s flagship .45 ACP platforms, it remains a prominent part of their current production lineup.
Conclusion
When you’re handling the Glock 21, you’ll appreciate its .45 ACP chambering and polymer-frame construction. The pistol’s 13-round magazine capacity and 32.28-ounce loaded weight deliver substantial firepower in a manageable package. You’ll find the 4.6-inch hexagonal-rifled barrel provides consistent accuracy at defensive distances. Despite its larger frame dimensions, you’re getting a battle-tested platform that’s earned its reputation through decades of law enforcement and civilian service.
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