Question 1

What makes the Glock 37 Gen4 different from other .45 caliber handguns?

Accepted Answer

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 PowerThe 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 ControlThe Gen4 Rough Texture frame and interchangeable backstraps allow for a more secure grip, reducing felt recoil and improving control during rapid fire.

 	
Law Enforcement AdoptionSeveral law enforcement agencies chose the Glock 37 for its balance of power and size, proving its reliability under demanding conditions.

 	
Safe Action® SystemThis three-safety system offers consistent trigger pull and prevents accidental discharge, making it both secure and easy to operate.

Question 2

Is the Glock 37 Gen4 suitable for concealed carry?

Accepted Answer

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 ModelsThe .45 GAP cartridge allows a narrower grip, making the pistol easier to conceal under clothing than comparable .45 ACP pistols.

 	
Balanced Weight and SizeAt 27 ounces unloaded, the Glock 37 Gen4 is lighter than most .45-caliber service pistols, making daily carry more comfortable.

 	
Holster CompatibilityIt 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 CarriersDue to its power, it is better suited for those who have experience with recoil management and situational awareness in concealed carry environments.

Question 3

Can I use .45 ACP ammunition in a Glock 37 Gen4?

Accepted Answer

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 DifferenceThe .45 GAP cartridge is shorter and operates at different pressures than the .45 ACP, making it incompatible with the Glock 37 chamber.

 	
Potential Safety HazardsAttempting to chamber .45 ACP rounds could result in feeding issues, misfires, or catastrophic failures. Always follow the manufacturer’s ammunition specifications.

 	
Factory RecommendationsGlock explicitly states that the 37 Gen4 should only use factory-manufactured .45 GAP rounds to maintain performance and safety.

 	
Availability of .45 GAPWhile less common than .45 ACP, .45 GAP ammunition is available online and at specialty retailers; stocking up ensures uninterrupted use.

Question 4

How reliable is the Glock 37 Gen4?

Accepted Answer

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 DurabilityWith fewer internal parts than most semi-automatics, there’s less that can go wrong under stress or heavy use.

 	
Performance in Extreme ConditionsLike all Glocks, the 37 Gen4 has been tested in mud, sand, and water, maintaining functionality where many other pistols fail.

 	
Trusted by Law EnforcementAgencies that adopted the Glock 37 did so because of its consistent firing, low maintenance, and ability to function in high-stress conditions.

 	
Ease of MaintenanceIts tool-free takedown allows fast cleaning and inspection after each use, extending service life and reliability.

Question 5

What is included with the Glock 37 Gen4 purchase?

Accepted Answer

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 MagazinesEach pistol comes with three standard magazines to ensure you have sufficient capacity for training or duty use.

 	
Hard Carry CaseA durable Glock-branded case is included for safe storage and transport, protecting the firearm from damage.

 	
Cleaning Rod and BrushBasic cleaning tools are included to help you maintain the barrel and chamber after each shooting session.

 	
Modular Backstrap SetThe Gen4 backstrap kit allows you to customize grip size for optimal ergonomics and control.

 	
Instruction Manual and WarrantyEvery Glock 37 Gen4 includes the official manual for operation, maintenance, and disassembly, along with manufacturer warranty documentation.

Question 6

Does the Glock 37 Gen4 require a break-in period?

Accepted Answer

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 RecommendedFiring 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-InAvoid 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 PatternsThe 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 ExtractionWatch 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 SessionDuring the first few hundred rounds, fouling builds up quickly. Clean the barrel, slide rails, and feed ramp after each outing.

 	
Lubrication Settles InRegular firing helps distribute lubricant evenly and seat moving parts into their operational rhythm, improving long-term performance.

Question 7

Can I install aftermarket sights or parts?

Accepted Answer

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 UpgradesReplace factory fixed sights with night sights, fiber optics, suppressor-height sights, or adjustable competition-grade options.

 	
Trigger System EnhancementsAftermarket triggers can reduce pull weight, improve reset, and enhance overall responsiveness—ideal for competitive or defensive use.

 	
Barrel ReplacementsMatch-grade barrels from reputable brands can increase accuracy, particularly for target shooters or reloaders.

 	
Slide ModificationsAdd slide cuts, optics-ready cuts, or Cerakote finishes for both functional and aesthetic upgrades.

 	
Magwell AttachmentsMagwell flares can help speed up reloads by guiding magazines more easily into place—beneficial in defensive or competitive scenarios.

 	
Internal Component KitsUpgrade connector bars, firing pins, and recoil springs for tailored feel and cycling behavior, provided they come from tested sources.

 	
Light and Laser AccessoriesThe integrated Glock rail allows mounting of tactical lights, lasers, or combo units to enhance visibility in low-light conditions.

Question 8

Is the .45 GAP ammo widely available?

Accepted Answer

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 BrandsCompanies like Speer, Federal, and Winchester continue to manufacture .45 GAP ammo, particularly for law enforcement supply chains.

 	
Best Accessed OnlineWhile local gun stores may have limited inventory, online platforms often stock multiple bullet weights and configurations.

 	
Practice and Self-Defense Loads AvailableYou can find full metal jacket (FMJ) rounds for range use and jacketed hollow points (JHP) for defense in the .45 GAP lineup.

 	
Bulk Buying RecommendedPurchasing in bulk helps ensure availability and often results in cost savings, especially for less common calibers.

 	
Reloading Possible but Less CommonHandloading is possible but not as widespread due to limited case availability; ensure you use proper .45 GAP-specific dies.

 	
Check Compatibility Before PurchaseAlways double-check that ammunition is labeled specifically as .45 GAP and not .45 ACP to avoid dangerous mismatches.

Question 9

How do I disassemble the Glock 37 Gen4 for cleaning?

Accepted Answer

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 ChamberAlways begin by removing the magazine and visually/physically confirming that the chamber is empty. Safety comes first.

 	
Pull Slide Slightly RearwardPull 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 ForwardWhile holding the takedown tabs down, allow the slide to move forward and off the frame gently.

 	
Remove Recoil Spring and BarrelTake out the dual recoil spring assembly, followed by lifting the barrel out of the slide. These are the main components for cleaning.

 	
Clean and LubricateWipe down the frame, slide, barrel, and spring. Apply Glock-recommended lubricant at specified points to ensure optimal operation.

 	
Reassemble in Reverse OrderReinsert the barrel, followed by the recoil spring, then slide the upper back onto the frame until it locks into place.

Question 10

What holsters are recommended for Glock 37 Gen4?

Accepted Answer

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) HolstersBest for concealed carry; Kydex and hybrid designs offer comfort and retention while keeping the firearm close to the body.

 	
OWB (Outside-the-Waistband) HolstersIdeal 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 HolstersUseful for sitting or driving scenarios, shoulder rigs distribute the firearm's weight evenly and offer easy access.

 	
Retention Holsters with Level II/III SecurityPreferred by law enforcement, these holsters prevent unauthorized draw with locking mechanisms or push-button releases.

 	
Leather Options for Style and ComfortLeather holsters conform to the body over time and provide a classic, comfortable aesthetic for daily wear.

 	
Tactical Holsters with Light CompatibilityIf you mount a tactical light or laser on the Glock rail, choose a holster designed to accommodate the added bulk without sacrificing retention.

Question 11

Is the Glock 37 Gen4 legal in my state or country?

Accepted Answer

The legality of the Glock 37 Gen4 depends entirely on the firearm regulations of your state or country. Brownell Glock ships only after verifying that the customer has provided all necessary documentation, including firearm permits or licenses. This ensures every order remains fully compliant.


 	
Varying Firearm RegulationsDifferent states and countries impose different rules on handgun ownership, magazine capacity, and shipping. Always check local laws before placing an order.

 	
Permit or License VerificationWe require proof of a valid firearms license or permit before processing your order, ensuring you remain legally protected.

 	
Magazine Capacity RestrictionsSome states limit magazine capacity below the Glock 37’s standard 10-round magazines; we can accommodate compliant magazines where required.

 	
International Shipping ComplianceFor international orders, we review importation laws to ensure the firearm can legally enter the destination country.

 	
Customer ResponsibilityUltimately, it’s the buyer’s responsibility to understand and comply with local laws. Our verification process is an added safeguard.

Question 12

What’s the effective range of the Glock 37 Gen4?

Accepted Answer

The Glock 37 Gen4 is designed as a defensive handgun, so its effective range prioritizes accuracy and stopping power at typical self-defense distances. With practice and quality ammunition, it can perform well beyond close quarters.


 	
Optimal Defensive RangeThe pistol is most effective within 7–25 yards, where its stopping power and accuracy excel in high-stress situations.

 	
Extended Accuracy with PracticeSkilled shooters can consistently hit targets at 50 yards or more, particularly with the fixed factory sights properly aligned.

 	
Ballistic Performance of .45 GAPThe .45 GAP round retains energy and velocity well at defensive distances, offering deep penetration and reliable expansion.

 	
Range Training RecommendedRegular training at varied distances improves shooter familiarity, reaction times, and accuracy with this platform.

Question 13

Is the grip size adjustable?

Accepted Answer

Yes. One of the major advantages of the Glock 37 Gen4 over earlier generations is its modular backstrap system, allowing you to customize the grip for your hand size and shooting style.


 	
Interchangeable Backstraps IncludedThe pistol ships with multiple backstrap sizes that can be installed quickly, without the need for specialized tools.

 	
Enhanced ErgonomicsA properly sized grip improves trigger reach, recoil management, and overall comfort during extended shooting sessions.

 	
Ideal for Multiple UsersAdjustable grips make it easy to share the firearm between shooters with different hand sizes while maintaining control and safety.

 	
Better Control Under RecoilA secure grip reduces muzzle flip, allowing faster follow-up shots and improved accuracy under stress.

Question 14

What is the recoil like on the Glock 37 Gen4?

Accepted Answer

The Glock 37 Gen4 delivers .45-caliber performance but manages recoil effectively due to its design and the .45 GAP cartridge’s characteristics. Shooters often describe its recoil as a smoother, more controllable push compared to the snappier feel of lighter rounds.


 	
Polymer Frame AbsorptionThe high-strength polymer frame flexes slightly under recoil, reducing felt impact on the shooter’s hands.

 	
Dual Recoil Spring AssemblyThe Gen4’s updated recoil spring system further dampens recoil and prolongs the life of internal parts.

 	
Lower Muzzle FlipCompared to some .45 ACP pistols, the shorter .45 GAP cartridge produces less muzzle rise, aiding in quicker sight recovery.

 	
Training Improves ControlRegular practice with proper stance and grip significantly reduces perceived recoil and improves shot-to-shot consistency.

Question 15

How often should I replace internal parts?

Accepted Answer

The Glock 37 Gen4 is engineered for longevity, but preventive maintenance ensures maximum reliability. Replacing certain parts at recommended intervals keeps the pistol running like new.


 	
Recoil Spring ReplacementReplace the recoil spring assembly every 3,000–5,000 rounds, as it absorbs most of the slide’s force during operation.

 	
Regular Inspection of Wear ComponentsInspect the extractor, firing pin spring, and trigger spring annually or after high-volume use to catch early wear.

 	
Use OEM or Certified PartsAlways use Glock factory or certified aftermarket parts to maintain safety and reliability; inferior components can cause malfunctions.

 	
Keep Records of Round CountsTracking your round count helps schedule part replacements proactively rather than reactively.

 	
Professional Armorer ServicePeriodically having the pistol inspected by a certified Glock armorer ensures all tolerances remain within safe specifications.

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