The Glock 37 Gen4 stands out because it delivers .45-caliber performance in a frame size closer to a 9mm Glock, thanks to its specialized .45 GAP cartridge. This unique balance makes it more ergonomic while retaining substantial stopping power.

• Compact Frame with High-Caliber Power
  The Glock 37 Gen4 uses the .45 GAP round, which was developed to provide .45-caliber performance in a frame similar to the Glock 17. This makes it easier to handle for shooters who find traditional .45 ACP pistols too bulky.

• Enhanced Grip for Better Control
  The Gen4 Rough Texture frame and interchangeable backstraps allow for a more secure grip, reducing felt recoil and improving control during rapid fire.

• Law Enforcement Adoption
  Several law enforcement agencies chose the Glock 37 for its balance of power and size, proving its reliability under demanding conditions.

• Safe Action® System
  This three-safety system offers consistent trigger pull and prevents accidental discharge, making it both secure and easy to operate.

While classified as a full-size pistol, the Glock 37 Gen4’s slimmer profile compared to traditional .45 ACP handguns makes it a viable choice for concealed carry with the right holster setup.

• Slimmer Profile than .45 ACP Models
  The .45 GAP cartridge allows a narrower grip, making the pistol easier to conceal under clothing than comparable .45 ACP pistols.

• Balanced Weight and Size
  At 27 ounces unloaded, the Glock 37 Gen4 is lighter than most .45-caliber service pistols, making daily carry more comfortable.

• Holster Compatibility
  It fits a wide variety of inside-the-waistband (IWB), outside-the-waistband (OWB), and appendix carry holsters specifically designed for full-size Glocks.

• Ideal for Trained Carriers
  Due to its power, it is better suited for those who have experience with recoil management and situational awareness in concealed carry environments.

No. The Glock 37 Gen4 is designed exclusively for .45 GAP ammunition. Using .45 ACP or other calibers can cause dangerous malfunctions and void warranties.

• Cartridge Design Difference
  The .45 GAP cartridge is shorter and operates at different pressures than the .45 ACP, making it incompatible with the Glock 37 chamber.

• Potential Safety Hazards
  Attempting to chamber .45 ACP rounds could result in feeding issues, misfires, or catastrophic failures. Always follow the manufacturer’s ammunition specifications.

• Factory Recommendations
  Glock explicitly states that the 37 Gen4 should only use factory-manufactured .45 GAP rounds to maintain performance and safety.

• Availability of .45 GAP
  While less common than .45 ACP, .45 GAP ammunition is available online and at specialty retailers; stocking up ensures uninterrupted use.

The Glock 37 Gen4 is renowned for its reliability, inheriting Glock’s legacy of rugged, low-maintenance design and combining it with a high-caliber chambering suitable for demanding environments.

• Minimal Parts for Maximum Durability
  With fewer internal parts than most semi-automatics, there’s less that can go wrong under stress or heavy use.

• Performance in Extreme Conditions
  Like all Glocks, the 37 Gen4 has been tested in mud, sand, and water, maintaining functionality where many other pistols fail.

• Trusted by Law Enforcement
  Agencies that adopted the Glock 37 did so because of its consistent firing, low maintenance, and ability to function in high-stress conditions.

• Ease of Maintenance
  Its tool-free takedown allows fast cleaning and inspection after each use, extending service life and reliability.

When you purchase the Glock 37 Gen4 from Brownell Glock, you receive all the original manufacturer accessories plus the security of discreet, documented shipping.

• Three 10-Round Magazines
  Each pistol comes with three standard magazines to ensure you have sufficient capacity for training or duty use.

• Hard Carry Case
  A durable Glock-branded case is included for safe storage and transport, protecting the firearm from damage.

• Cleaning Rod and Brush
  Basic cleaning tools are included to help you maintain the barrel and chamber after each shooting session.

• Modular Backstrap Set
  The Gen4 backstrap kit allows you to customize grip size for optimal ergonomics and control.

• Instruction Manual and Warranty
  Every Glock 37 Gen4 includes the official manual for operation, maintenance, and disassembly, along with manufacturer warranty documentation.

While Glocks are well-known for functioning right out of the box, giving your Glock 37 Gen4 a short break-in period helps ensure smoother cycling, improved reliability, and better component fit. This is especially important when using defense-grade ammunition or carrying the firearm for critical use.

• Initial 200-Round Break-In Recommended
  Firing at least 200 rounds of quality factory ammunition helps cycle the slide, soften the recoil spring slightly, and polish internal friction points.

• Use Full-Power Ammunition During Break-In
  Avoid low-recoil or light loads during the break-in phase, as they may not cycle the slide fully and could lead to malfunctions.

• Observe for Wear Patterns
  The first few sessions allow you to spot any irregular wear or tight points in the trigger bar, slide, or locking block that might need attention.

• Monitor Feeding and Extraction
  Watch for issues like failure to feed or extract. These are rare but easier to correct early with proper cleaning and lubrication.

• Clean Thoroughly After Each Session
  During the first few hundred rounds, fouling builds up quickly. Clean the barrel, slide rails, and feed ramp after each outing.

• Lubrication Settles In
  Regular firing helps distribute lubricant evenly and seat moving parts into their operational rhythm, improving long-term performance.

Yes. The Glock 37 Gen4 is fully compatible with a wide array of aftermarket components. Whether for enhanced accuracy, aesthetic customization, or tactical performance, the firearm supports significant personalization without sacrificing reliability.

• Sight Upgrades
  Replace factory fixed sights with night sights, fiber optics, suppressor-height sights, or adjustable competition-grade options.

• Trigger System Enhancements
  Aftermarket triggers can reduce pull weight, improve reset, and enhance overall responsiveness—ideal for competitive or defensive use.

• Barrel Replacements
  Match-grade barrels from reputable brands can increase accuracy, particularly for target shooters or reloaders.

• Slide Modifications
  Add slide cuts, optics-ready cuts, or Cerakote finishes for both functional and aesthetic upgrades.

• Magwell Attachments
  Magwell flares can help speed up reloads by guiding magazines more easily into place—beneficial in defensive or competitive scenarios.

• Internal Component Kits
  Upgrade connector bars, firing pins, and recoil springs for tailored feel and cycling behavior, provided they come from tested sources.

• Light and Laser Accessories
  The integrated Glock rail allows mounting of tactical lights, lasers, or combo units to enhance visibility in low-light conditions.

The .45 GAP cartridge, while less commonly found than 9mm or .45 ACP, is still available from major manufacturers and reputable online stores. With proper planning, it remains a sustainable option for regular use.

• Available from Major Brands
  Companies like Speer, Federal, and Winchester continue to manufacture .45 GAP ammo, particularly for law enforcement supply chains.

• Best Accessed Online
  While local gun stores may have limited inventory, online platforms often stock multiple bullet weights and configurations.

• Practice and Self-Defense Loads Available
  You can find full metal jacket (FMJ) rounds for range use and jacketed hollow points (JHP) for defense in the .45 GAP lineup.

• Bulk Buying Recommended
  Purchasing in bulk helps ensure availability and often results in cost savings, especially for less common calibers.

• Reloading Possible but Less Common
  Handloading is possible but not as widespread due to limited case availability; ensure you use proper .45 GAP-specific dies.

• Check Compatibility Before Purchase
  Always double-check that ammunition is labeled specifically as .45 GAP and not .45 ACP to avoid dangerous mismatches.

Disassembling the Glock 37 Gen4 for routine cleaning is straightforward and tool-free. Following the standard field-stripping method ensures you can clean and inspect all critical components.

• Unload and Double-Check Chamber
  Always begin by removing the magazine and visually/physically confirming that the chamber is empty. Safety comes first.

• Pull Slide Slightly Rearward
  Pull the slide back about a quarter of an inch while simultaneously pulling down on both takedown tabs located on each side of the frame.

• Release the Slide Forward
  While holding the takedown tabs down, allow the slide to move forward and off the frame gently.

• Remove Recoil Spring and Barrel
  Take out the dual recoil spring assembly, followed by lifting the barrel out of the slide. These are the main components for cleaning.

• Clean and Lubricate
  Wipe down the frame, slide, barrel, and spring. Apply Glock-recommended lubricant at specified points to ensure optimal operation.

• Reassemble in Reverse Order
  Reinsert the barrel, followed by the recoil spring, then slide the upper back onto the frame until it locks into place.

Choosing the right holster is essential for safe, secure, and comfortable carry of the Glock 37 Gen4. Whether for concealed or open carry, the pistol’s standard Glock profile makes it compatible with many high-quality holster types.

• IWB (Inside-the-Waistband) Holsters
  Best for concealed carry; Kydex and hybrid designs offer comfort and retention while keeping the firearm close to the body.

• OWB (Outside-the-Waistband) Holsters
  Ideal for open carry or range use. These holsters allow faster draw times and are compatible with most duty belts.

• Appendix Carry Holsters (AIWB)
  Suitable for users comfortable with forward-positioned carry, often incorporating built-in wedges for concealment comfort.

• Shoulder Holsters
  Useful for sitting or driving scenarios, shoulder rigs distribute the firearm’s weight evenly and offer easy access.

• Retention Holsters with Level II/III Security
  Preferred by law enforcement, these holsters prevent unauthorized draw with locking mechanisms or push-button releases.

• Leather Options for Style and Comfort
  Leather holsters conform to the body over time and provide a classic, comfortable aesthetic for daily wear.

• Tactical Holsters with Light Compatibility
  If you mount a tactical light or laser on the Glock rail, choose a holster designed to accommodate the added bulk without sacrificing retention.