The Glock 31 utilizes Glock’s Safe Action system in a full-size .357 SIG platform, delivering high-powered performance with a 15-round capacity. You’ll find a 114mm barrel, 660g unloaded weight, and polymer frame construction with a corrosion-resistant slide. The pistol features three integrated safeties, a 5.5-7.7 lb trigger pull, and reliable operation in harsh conditions. First introduced in 1998, this third-generation Glock offers extensive customization options and proven tactical capabilities.
Key Takeaways
- The Glock 31 is a .357 SIG caliber pistol featuring a 15-round standard magazine and Glock’s proven Safe Action system.
- Weighing 660g unloaded, it has a 114mm barrel length and incorporates three integrated safety features without external manual safeties.
- Released in 1998 as part of Glock’s third generation, it’s designed for law enforcement and military use in harsh conditions.
- The pistol combines a corrosion-resistant slide with a durable polymer frame, requiring minimal maintenance for reliable performance.
- Standard models cost between $500-$650, with optional upgrades available for sights and special finishes.
Description
The Glock 31 operates in .357 Sig caliber and employs Glock’s proprietary Safe Action system.
You’ll find this pistol equipped with a 114mm barrel and polymer frame construction, weighing 660g unloaded. The standard magazine configuration holds 15 rounds, with optional 16 or 10-round capacities available.
The pistol’s corrosion-resistant slide finish and robust design ensure reliable performance in demanding conditions.
Price Range
Standard Glock 31 models retail between $500 and $650, aligning with their robust engineering and performance specifications. You’ll find pricing variations based on several key factors that reflect the pistol’s superior build quality and high-capacity design.
| Price Factor | Base Model | Premium Package |
|---|---|---|
| New Condition | $500 | $650 |
| Custom Sights | +$75 | Included |
| Special Finish | +$100 | Included |
Local taxes and shipping costs will affect your final purchase price, while specialized modifications can further increase investment.
Specifications
The Glock 31 brings you a polymer-framed pistol chambered in .357 SIG with a standard magazine capacity of 15 rounds, though 10 and 16-round options exist. You’ll find this handgun weighs 660 g (23.28 oz) unloaded and incorporates Glock’s signature Safe Action system. The firearm’s overall dimensions showcase a 202 mm total length with a 114 mm barrel length, making it a full-sized service pistol.
| Specification | Value |
|---|---|
| Weight (unloaded) | 660 g (23.28 oz) |
| Barrel Length | 114 mm (4.49″) |
| Total Length | 202 mm (7.95″) |
| Magazine Capacity | 15 rounds (std) |
Weight
Weighing in at precisely 660 grams (23.28 ounces), Glock 31’s unloaded mass maintains a balanced profile without its magazine. The overall weight distribution contributes to the handgun’s controlled handling characteristics.
When you’re evaluating this firearm’s specifications, you’ll find its unloaded weight positions it within an optimal range for a duty pistol, enhancing your shooting precision and maneuverability.
Barrel Length
Featuring a precision-engineered 114mm (4.49-inch) barrel, the Glock 31 delivers optimal ballistic performance for its .357 SIG chambering. You’ll find the barrel length strikes an ideal balance between concealability and high-velocity capabilities.
The fixed barrel configuration incorporates polygonal rifling for enhanced precision, making it particularly effective in tactical and defensive scenarios where accuracy is paramount.
Material Made Out Of
Built around a reinforced polymer frame, the Glock 31’s material composition exemplifies modern firearm engineering.
You’ll find a nitride-finished steel alloy slide that resists corrosion, paired with a high-strength steel alloy barrel. The magazine features polymer material construction with steel internals, while the firing mechanism utilizes precision-engineered steel components for reliable operation and extended service life.
Chambered In
The Glock 31 chambers the powerful .357 SIG cartridge, delivering impressive ballistic performance with muzzle velocities that exceed many comparable service pistols.
You’ll find this round offers exceptional stopping power while maintaining manageable recoil. The pistol’s standard magazine capacity lets you carry 15 rounds of .357 SIG ammunition, though you can opt for 16-round or reduced 10-round magazines depending on your needs.
Capacity
Standard magazine capacity for the Glock 31 comes in at 15 rounds of .357 SIG ammunition, with optional configurations available to match your specific requirements.
You’ll find additional magazine options offering either 16-round extended capacity or reduced 10-round configurations. This pistol with large magazine capacity provides optimal ammunition reserves for law enforcement and defensive applications, exceeding the capacity of comparable 9mm variants in the Glock lineup.
Trigger Pull
Featuring Glock’s signature Safe Action system, the Model 31’s trigger demonstrates a predictable pull weight ranging from 5.5 to 7.7 pounds through its complete travel distance. You’ll experience a smooth, consistent trigger pull with a predictable break, optimized for accuracy during rapid fire.
The integrated safety mechanisms prevent accidental discharge, while the short, crisp reset allows for quick follow-up shots throughout the pistol’s service life.
Safety?
Like all Glock pistols, Model 31 incorporates three automated safety mechanisms within its Safe Action system. You’ll find a trigger safety that blocks unintentional activation, an internal firing pin safety preventing discharge unless the trigger is pulled, and a drop safety ensuring the pistol won’t fire if dropped.
This integrated safe action system provides reliable protection while maintaining a consistent trigger pull without external manual safeties.
Action
The Glock 31’s Safe Action system operates through a striker-fired, recoil-operated design, delivering consistent performance in .357 SIG caliber. The system utilizes the pistol’s 660g weight and 114mm barrel length to manage recoil forces effectively.
You’ll find this striker-fired mechanism works in harmony with the Safe Action system, providing reliable cycling through standard 15-round magazines or optional 10/16-round configurations.
Optic Ready?
Unlike many modern pistols, standard Glock 31 models don’t come optics-ready from the factory, requiring aftermarket modifications for red dot sight compatibility.
While the Gen4 Technology area offers custom GLOCK accessories, you’ll need third-party slide milling or a specialty slide for optics mounting.
GEN4/GEN5 MODELS offer dovetail adapter plates as an alternative solution, though direct slide modification typically provides better stability and performance.
Review
You’ll find the Glock 31’s Safe Action system and polymer frame deliver exceptional reliability across thousands of rounds, with minimal maintenance requirements and consistent performance in various conditions.
While the .357 SIG ammunition costs more than 9mm and generates increased muzzle flip during rapid fire, the pistol’s 15+1 capacity and 4.49-inch barrel provide enhanced accuracy and stopping power that many users consider worth the trade-off.
The nitride-finished slide, precision barrel, and robust construction have earned the G31 high marks from law enforcement and civilian users alike, particularly for its role as a duty or home defense weapon.
Pros
Building upon Glock’s proven design philosophy, the Model 31 delivers exceptional performance through its .357 SIG chambering and advanced engineering. You’ll experience superior precision and high velocity from the Glock Marksman Barrel, while the polymer frame ensures durability.
| Feature | Benefit | Performance |
|---|---|---|
| .357 SIG Caliber | Stopping Power | Superior |
| Safe Action System | Triple Safety | Reliable |
| Nitride Finish | Corrosion Resistant | Durable |
| Fixed Sights | Quick Target Acquisition | Tactical |
| Polymer Frame | Weather Resistant | Long-lasting |
Cons
Several notable drawbacks exist with the Glock 31 that potential buyers should consider. You’ll notice higher recoil impulse during shooting, increased muzzle flash, and louder report compared to similar weapons. The standard sights limit long-range accuracy potential.
| Limitation | Impact |
|---|---|
| Recoil | Higher impulse than peers |
| Sights | Less precise at range |
| Size | Harder to conceal |
| Muzzle Flash | More pronounced |
| Capacity | Lower than competitors |
Reliability
The Glock 31’s reliability stands as its most distinctive attribute, consistently demonstrating flawless operation across demanding conditions. You’ll find it performs without failure through extensive firing sessions, harsh environments, and high-stress situations.
The Glock Safe Action System and stringent quality control ensure best-in-class dependability, making it a trusted choice for law enforcement and military operations where reliability is paramount.
Similar Models
Similar models in Glock’s lineup showcase distinct differences from the full-sized Glock 31. The compact Glock 43, while sharing the SIG pistol’s Safe Action system and polymer construction, offers a smaller profile optimized for concealed carry.
However, you’ll find the G31’s longer 4.49-inch barrel and 15-round capacity deliver superior muzzle velocity, making it the optimum solution for tactical and law enforcement applications.
Similar Models From Other Manufacturers
While competing manufacturers offer numerous alternatives to the Glock 31, several standout models warrant consideration.
You’ll find Magnum performance in options like the Sig Sauer P320 and Smith & Wesson M&P40. The Beretta PX4 Storm features a distinctive rotating barrel design, while the Springfield XD-M Elite delivers high-capacity functionality. The CZ P-10 C rounds out the polymer-framed .357 SIG alternatives with comparable specifications.
Maintenance
Proper maintenance of your Glock 31 ensures optimal performance and longevity of the pistol. You’ll need to regularly clean and inspect all components using approved Glock cleaning kits and lubricants.
Follow the owner’s manual for correct disassembly procedures during maintenance. Check for worn or damaged parts that require replacement.
Always store your unloaded Glock 31 in a secure location, separate from ammunition.
History
Glock rolled out the Model 31 in 1998 as part of their third-generation pistol lineup, chambered in the then-new .357 SIG cartridge. Law enforcement agencies seeking high muzzle velocity quickly adopted the pistol for its ballistic advantages.
The Gen3 design featured the company’s proven polymer frame technology and modular back strap system, making it a popular choice for military and police forces worldwide.
Frequently Asked Questions
Is a Glock 31 a Good Gun?
You’ll find exceptional reliability in this platform, with a proven trigger mechanism that delivers consistent break and reset. The customization options let you tailor the grip to your hand size through interchangeable backstraps.
Its .357 SIG chambering provides significant stopping power, while the polymer frame reduces weight without compromising durability. The precision-engineered barrel and slide assembly ensure accuracy, making it an excellent choice for both duty and defensive applications.
Is Glock 31 Discontinued?
You’ll find that the Glock 31 isn’t officially discontinued, but production changes have made it less common in current markets. While Glock still maintains technical specifications for the .357 SIG model, they’ve shifted focus to more popular calibers.
The Glock 31’s performance characteristics remain unchanged, featuring a 15-round capacity and proven reliability. For purchase considerations, you can still find new and used models through authorized dealers, though availability may be limited.
What Bullets Can a Glock 31 Shoot?
Hold your horses, partner – let’s talk about your ammunition options. You can safely fire two specific cartridges in your Glock 31: the .357 SIG and .40 S&W (with a barrel swap).
The .357 SIG offers superior ballistic performance with velocities reaching 1,350 fps, while the .40 S&W provides excellent recoil management.
Don’t attempt to use 9mm or .45 ACP – they’re incompatible and unsafe. Magazine capacity remains identical for both compatible cartridges.
Why Is the Glock 19 Illegal?
The Glock 19 isn’t inherently illegal – it’s actually one of the most popular handguns for civilian use. However, you’ll find that availability varies by state due to specific concealed carry laws and local gun legislation.
Some states have restrictions on magazine capacity or specific features. You’ll need to check your local regulations, as certain configurations or modifications may be restricted. The standard Glock 19 remains legal for civilian ownership in most U.S. jurisdictions.
Conclusion
You’ll find the Glock 31 operates efficiently in the .357 SIG caliber, maintaining the manufacturer’s proven “Safe Action” system. The pistol achieves muzzle velocities of 1,350 fps with standard ammunition, surpassing the traditional .40 S&W by 250 fps. The polymer frame and hexagonal rifling deliver a service life exceeding 20,000 rounds when properly maintained. Barrel twist rate is 1:9.84″ with right-hand rifling.
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