The Glock 40 is Glock's long-slide 10mm Auto platform—a 6.02-inch barrel, 15-round capacity, and MOS-ready slide that ships configured for optic mounting. At 9.49 inches overall with an 8.31-inch sight radius, it is not a concealed carry pistol.
It is a hunting sidearm, a backcountry trail gun, and a long-range target platform built around the 10mm cartridge's velocity and energy advantages over standard service calibers.
Accessory selection for the G40 follows directly from those roles. The MOS slide makes optic mounting the first priority for most owners. Holster fit must account for both the extended barrel length and any mounted optic.
Magazines are shared with the G20, simplifying the supply side. And the 10mm's operating energy makes recoil spring maintenance more relevant here than on any standard-pressure 9mm platform.
One critical fitment note before purchasing anything: the Glock 40 has been discontinued by Glock. Accessories marketed for the G20 may or may not fit due to barrel length differences—always verify that any holster, light, or accessory is confirmed for the G40's specific slide geometry, not just the G20 family in general.
Holsters for the Glock 40
Holster fit for the G40 is not interchangeable with standard full-size Glock holsters. The 6.02-inch barrel extends significantly beyond the G17 or G20 frame length, and any mounted MOS optic changes the holster geometry further.
IWB Holsters
Concealed IWB carry is uncommon with the G40 given its overall size and weight, but it is used by large-framed shooters in cold-weather clothing. A purpose-fit IWB holster with adjustable cant and strong-side positioning at 3–4 o'clock is the most workable configuration. Optic clearance must be verified for the specific red dot installed.
OWB Paddle Holsters
Paddle holsters are practical for the G40's primary roles—range use, hunting trips, and field carry—because they attach and detach without removing a belt. Optic-compatible OWB paddle holsters for the G40 are available and appropriate for open-carry or duty-adjacent use where concealment is not required.
Belt Holsters
OWB belt-loop holsters thread directly onto a gun belt for maximum stability. The G40's weight loaded—particularly with a mounted optic—demands a stiff, reinforced gun belt and a holster with firm belt attachment. The correct choice for extended open carry or backcountry wear where positional stability matters.
Drop Leg Holsters
Drop leg platforms are among the most practical configurations for the G40 in hunting and outdoor use. Positioning the long-slide pistol on the thigh clears belt-mounted gear, keeps the pistol accessible during pack carry, and distributes weight away from the waistline. Verify that the drop leg platform accommodates the G40's barrel length and optic profile.
Chest Holsters
Chest carry is one of the best-suited configurations for the G40 in backcountry and hunting roles. A chest holster keeps the long-slide 10mm accessible while wearing a pack, positions it away from hip-mounted gear, and allows a fast draw from a standing or seated position in the field. Ensure the chest rig is rated for the G40's weight with a full magazine and mounted optic.
Optics for the Glock 40
The MOS configuration is the G40's defining accessory feature. The slide ships with a modular optic system that accepts multiple adapter plates for popular red dot footprints.
For hunting, precision shooting, and backcountry use, a quality red dot or micro reflex sight is the single highest-return upgrade on this platform.
MOS Adapter Plates
Glock's MOS system uses interchangeable adapter plates that allow the slide to accept different optic footprints without milling.
The standard G40 MOS kit ships with plates for several common patterns including Trijicon RMR, Leupold DeltaPoint Pro, Docter, and Insight/Meopta footprints. C&H Precision Weapons produces direct-mill MOS plates and adapter solutions that lower the optic slightly closer to the bore axis than standard raised plates—a meaningful improvement for shooters who want the lowest possible optic height.
The most important fitment step is confirming which MOS plate version your specific G40 uses before ordering aftermarket plates. Glock has revised the MOS system across generations, and plates from different MOS generations are not always interchangeable.
Red Dot Sights
For hunting use, the Trijicon RMR Type 2 and Holosun 507C are the most commonly mounted optics on the G40.
Both offer durable aluminum construction, proven recoil resistance across thousands of rounds, and battery life measured in years on standard settings. The RMR is the more proven choice for field use in harsh conditions; the Holosun 507C offers a larger window and solar backup cell at a lower price point.
For extended-range precision shooting where the G40 is stretched to its full potential, a magnified pistol scope or a longer-eye-relief hunting optic mounted via the MOS system provides capability beyond what a reflex dot delivers at 50–100 yards.
Leupold DeltaPoint Pro
The DeltaPoint Pro is specifically listed among common G40 MOS mounting solutions and is a popular hunting optic choice for the platform. Its wider, lower-profile window is an advantage when tracking moving game or acquiring targets quickly from field positions.
Battery access from the front of the optic—without removing it from the slide—is a practical field advantage over designs that require optic removal for battery changes.
Common Optic Mistakes
Mounting a red dot on the G40 without installing suppressor-height backup irons is the most common setup error. Standard-height Glock polymer sights do not co-witness through most mounted optics. If the optic fails in the field, you need usable iron backup sights—not factory polymer sights buried below the optic body.
A second common mistake is under-torquing MOS plate screws. The G40's 10mm recoil is substantially more energetic than 9mm, and red dots will shift zero or detach entirely from plates that are not properly torqued and secured with blue thread-locker.
Use the manufacturer's specified torque value and recheck after the first 50–100 rounds.
Sights for the Glock 40
Factory G40 polymer sights are inadequate for a pistol used in hunting or precision roles, and they do not co-witness with most mounted optics. Upgrading to metal sights—either as a standalone improvement or as backup irons to a mounted optic—is a standard first step.
Suppressor-Height Night Sights
Suppressor-height sights are designed to rise above a mounted optic, allowing iron sight use if the optic fails. Trijicon's HD XR suppressor-height sights and XS Sights DXT2 big dot suppressor-height options are both confirmed fits for Glock MOS pistols in the appropriate frame size.
These provide tritium low-light capability alongside optic co-witness at a height compatible with most red dot bodies.
Dueck Defense RBU (Rapid Backup Sights) mount to the side of the optic body rather than the traditional sight channel and provide a true co-witness backup without needing raised sight towers. This is a more complex installation but eliminates the height-over-bore issue entirely.
Standard Night Sights
For G40 owners running the pistol without a mounted optic—iron sights only for hunting or range use—Trijicon HD, Ameriglo, and Meprolight all produce G40-compatible tritium night sights in standard height.
The G40's long sight radius makes it particularly capable with quality iron sights, and a tritium front with a blacked-out rear is a fast and effective hunting sight configuration for shots out to 50 yards.
Fiber-Optic Sights
Fiber-optic front sights improve daylight acquisition on a platform where the long sight radius already rewards precision.
Warren Tactical and Hi-Viz both produce Glock-compatible fiber-optic fronts that pair well with an adjustable black rear for target and hunting use in normal lighting conditions.
Sight Installation Notes
G40 sight installation uses the same dovetail dimensions as other Gen4 Glock frames in the full-size family. The MGW Sight-Pro and Brownells Universal Sight Tool both handle G40 slides with appropriate shoe plates.
Front sight replacement requires the correct Glock front sight tool—do not attempt to drift the front sight, as it is screw-mounted, not pressed.
Lights for the Glock 40
The G40 carries the standard Glock accessory rail forward of the trigger guard, compatible with most Picatinny and Glock-pattern rail-mount lights.
While the G40 is more commonly associated with optics than weapon lights, a WML is a practical addition for property defense, home defense staging, or night hunting applications where the G40's power is relevant.
Weapon-Mounted Lights
The Streamlight TLR-1 HL is the most commonly recommended WML for the G40 frame size. At 1,000 lumens with a broad flood beam, it is well-matched to the distances at which a 10mm pistol is most useful defensively.
The Surefire X300U-B at 1,000 lumens is a more expensive but equally capable option with a longer track record in professional use.
For hunting and outdoor roles where lighting an animal or a trail obstacle matters more than tight beam focus, a higher-lumen flood configuration is more useful than a narrow tactical beam. The TLR-1 HL's flood pattern serves this role well.
Holster Compatibility with a WML
Adding a WML to the G40 means the holster must be replaced with a light-bearing version confirmed for the G40 barrel length and the specific light model. This is a non-trivial combination—G40 light-bearing holsters are less commonly stocked than standard-length Glock light-bearing options.
Confirm the exact holster is listed for both the G40 and your specific light before purchasing either.
Laser Options
Rail-mounted lasers from Crimson Trace, Viridian, and LaserMax fit the G40's standard rail. For hunting use, a green laser is significantly more visible in daylight than red and is the practical choice for an outdoor carry pistol.
A laser/light combination unit—Viridian C5L or similar—reduces the number of rail accessories needed while covering both functions in a single mount.
Magazines for the Glock 40
The G40 uses the same magazine as the G20—Glock's full-size 10mm double-stack magazine with 15-round standard capacity and 10-round California-compliant versions.
Magazine interchangeability between the G20 and G40 is one of the G40's practical advantages, as it simplifies sourcing and gives owners a larger pool of compatible products.
Factory Glock Magazines
Factory Glock G20/G40 magazines are the baseline for reliability. They are available through Brownells, MidwayUSA, and other major distributors.
For a hunting or field pistol, factory magazines run in a defensive or field role should be treated as consumables—inspect feed lips, springs, and followers regularly and replace any magazine that causes a feeding issue.
MecGar and Aftermarket Options
MecGar produces G20-pattern 10mm magazines that are widely regarded as the most reliable aftermarket option.
Their 15-round and extended-capacity versions have documented reliability records among high-volume G20/G40 shooters. For range use and magazine rotation in a field carry setup, MecGar is the standard aftermarket recommendation.
Extended Magazines
Glock and aftermarket vendors produce extended G20/G40 magazines running 20+ rounds.
These are more relevant for range training and competition than for hunting or field carry where magazine weight and bulk matter. For carry use, the standard 15-round flush magazine is the correct choice.
Magazine Pouches
For field and hunting carry with the G40, a single spare magazine in a secure belt or chest-mounted pouch is standard practice. 10mm magazine pouches must accommodate the G20/G40 double-stack width.
Kydex single-magazine carriers from holster makers who explicitly support the G40 footprint are the most reliable option—verify they fit the G20/G40 magazine dimensions rather than assuming compatibility from a generic "full-size Glock" listing.
Triggers for the Glock 40
The G40's factory trigger is a standard Glock Safe Action unit. It is consistent and reliable but carries the typical Glock trigger characteristics—moderate pre-travel, a wall, and a reset that is usable but not short.
For hunting and precision shooting where follow-up shot speed matters less than accuracy on the first shot, trigger upgrades are a meaningful investment.
Drop-In Trigger Connectors
Ghost Inc. produces trigger connectors for the G40 that reduce reset length and improve break feel without replacing the complete trigger group.
The Ghost 3.5 lb. connector is among the most commonly used aftermarket connectors across the Glock platform. For a hunting or outdoor pistol where the trigger will be used deliberately rather than rapidly, a connector swap is the most conservative upgrade—it preserves the Glock Safe Action function while meaningfully improving pull quality.
Verify that any connector is explicitly listed for Gen4 full-size Glock frames. The G40 uses Gen4 internals, and some connectors vary slightly in geometry between Gen3 and Gen4 fitment.
Complete Aftermarket Trigger Assemblies
Timney, Zev Technologies, and Overwatch Precision produce complete drop-in trigger assemblies for Glock full-size frames. These replace the factory trigger shoe, bar, and connector as a unit.
They provide more significant improvement in feel and reset than a connector swap alone, and they are reversible if you want to return to factory configuration.
For a G40 used in field or hunting roles, a Timney Alpha or Zev Pro curved trigger are common and well-documented options.
The Overwatch Precision TAC trigger offers a flat-face option that some shooters find improves trigger control by changing finger placement geometry.
Trigger Safety Considerations
Do not reduce trigger pull weight below the point where reliable primer ignition is maintained across your field ammunition.
10mm defensive and hunting loads vary in primer hardness, and an excessively light pull in a high-energy cartridge creates a reliability variable that is unacceptable in a field pistol.
Test any trigger modification with at least 200 rounds of your carry or hunting ammunition before trusting it in the field.
Grips and Backstraps for the Glock 40
The G40 Gen4 ships with Glock's modular backstrap system—small, medium, and large beavertail backstraps that adjust trigger reach for different hand sizes.
This is a significant ergonomic advantage over older Glock generations and is the first grip adjustment most owners should make before considering aftermarket solutions.
Backstrap Selection
Fitting the correct backstrap to your hand size before any other grip modification is the correct sequence. The backstrap affects trigger reach and felt recoil management simultaneously.
Most owners land on the medium or large beavertail backstrap for the G40 given the 10mm's recoil characteristics—the beavertail increases contact with the web of the hand and reduces perceived muzzle flip compared to the small flat backstrap.
Grip Tape and Traction Overlays
Talon Grips produces laser-cut adhesive grip overlays for the G40 in rubber and granulate texture.
Rubber texture is the carry-practical choice—tacky enough for a secure grip without aggressively abrading clothing or skin. Granulate texture adds more aggressive traction and is better suited for range and hunting use where a cover garment is not a daily consideration.
For a hunting or field pistol used in wet and cold conditions, aggressive grip texture is a genuine safety and performance improvement.
The G40's recoil requires a secure, consistent grip, and slick factory texturing in wet gloves is a real-world problem that grip tape directly addresses.
Stippling
Professional frame stippling is the most durable grip upgrade available. Unlike adhesive tape, stippling does not peel, shift, or wear down with holster use and field carry.
For a G40 that will see extended backcountry or hunting use, stippling by a Glock-experienced pistolsmith provides permanent traction improvement without altering frame dimensions in ways that affect holster fit.
Specify medium-aggressive texture to balance grip security against the comfort requirements of extended carry.
Grip Force Adapter
The Hogue Grip Force Adapter for Glock pistols is a drop-in component that replaces the factory backstrap assembly with a more aggressive beavertail and fills in the gap between the trigger guard and grip frame.
It improves grip consistency and reduces felt recoil without permanent frame modification. It is a useful upgrade for shooters who find the factory grip geometry too angular during sustained 10mm fire.
Cleaning and Maintenance for the Glock 40
The 10mm Auto operates at higher pressures and with more recoil energy than standard service cartridges. This makes routine maintenance more important on the G40 than on a 9mm Glock of comparable use volume.
Recoil springs, barrel condition, and slide rail cleanliness all require more frequent attention under sustained 10mm use.
Recoil Spring Maintenance
Glock recommends recoil spring replacement at approximately 5,000 rounds for standard-pressure calibers.
For the G40 shooting full-power 10mm loads—particularly hunting ammunition at the upper end of 10mm pressure specs—a more conservative 3,000-round replacement interval is appropriate.
A fatigued recoil spring in a 10mm pistol causes felt recoil to increase, slide velocity to rise, and reliability to degrade.
Wolff Gunsprings produces G20/G40 recoil spring assemblies in standard and increased-power options. For shooters running heavy 10mm hunting loads, a slightly increased-power spring can tame felt recoil and extend the service life of the frame and slide components.
Cleaning Kit Essentials
Standard 10mm/.40 caliber cleaning supplies cover all G40 maintenance needs. A bore brush and patch jag in .40/10mm caliber, cleaning rod, bore solvent, and lubricating oil are sufficient.
The G40's 6-inch barrel accumulates more fouling per cleaning session than shorter barrels at equivalent round counts—a longer cleaning rod or cable is necessary for full bore access. Otis and Real Avid both make 10mm-capable compact cleaning kits.
For copper fouling from jacketed hunting ammunition at high velocity, a dedicated copper solvent—Barnes CR-10 or Hoppe's Bench Rest Copper Solvent—is worth running through the bore periodically.
High-velocity 10mm hunting loads produce more copper fouling than standard-pressure 9mm defensive ammunition.
Lubrication Points
Primary lubrication points on the G40 are the slide rails, barrel hood and feed ramp, and the connector/trigger bar contact.
Light oil at the slide rails is sufficient for normal function. The barrel hood and feed ramp benefit from a light application of oil at every cleaning session under sustained field use conditions—dirt, grit, and temperature extremes affect lubrication retention more in field use than controlled indoor carry.
Avoid over-lubricating the firing pin channel. This is a standard Glock maintenance note, but it is more consequential on a 10mm platform where any reliability compromise in a hunting or field defensive scenario has higher stakes than a range malfunction.
Cases, Storage, and Transport for the Glock 40
Range and Transport Cases
The G40's 9.49-inch overall length requires a larger case than standard compact or full-size pistol cases. Pelican 1170 or 1200 cases comfortably accommodate the G40 with room for a mounted optic and two spare magazines.
A hard lockable case meets TSA requirements for checked baggage. For range trips, a soft pistol bag large enough for the G40's full length prevents handling damage without the bulk of a large hard case.
Field Carry Cases and Packs
For backcountry and hunting use, a pistol case or pack pouch sized for the G40 with optic installed is a practical staging accessory for camp or vehicle use.
Vertx, 5.11 Tactical, and similar makers produce pistol pouches in sizes that accommodate long-slide pistols with mounted optics.
Verify internal dimensions before purchasing—most standard pistol pouches are sized for compact or service-length pistols and will not fit the G40.
Quick-Access Safes
For home staging or bedside use, a quick-access safe from Hornady, Fort Knox, or Vaultek accommodates the G40 if sized for long-slide pistols.
Verify the internal dimensions against the G40's overall length with optic installed—standard pistol-sized quick-access safes are often too short. Rifle-format quick-access safes or larger pistol safes are the correct category for this platform.
Long-Term Storage
Store the G40 with a lightly oiled bore and slide, unloaded, in a low-humidity environment. The G40's polymer frame is humidity-resistant, but the steel slide and barrel require periodic attention in storage.
Rotate carry or field magazines through range use to exercise springs, and inspect the recoil spring assembly at each cleaning session if the pistol is in regular use.
Gun Belts and Carry Support for the Glock 40
The G40 loaded with a full magazine and mounted optic approaches 40+ ounces. Open carry of this platform demands a dedicated gun belt—not a fashion belt or a standard leather dress belt.
Duty-Grade Gun Belts
A 1.75-inch reinforced nylon rigger belt or heavy leather gun belt with an internal stiffener is the correct foundation for G40 open carry.
Cobra-buckle nylon belts from Blue Alpha Gear, Ares Gear, and similar makers provide excellent rigidity at a lower price point than premium leather and hold up better in field and wet conditions.
For dress or semi-formal open carry contexts, reinforced leather gun belts from Hanks or Beltman in 1.5-inch width provide the correct stiffness without a tactical appearance.
Drop Leg and Chest Rig Support
For backcountry use with the G40 in a drop leg or chest configuration, the platform belt or harness must be rated for the pistol's weight.
Cheap elastic drop leg straps will allow the holster to bounce and shift during hiking or physical activity.
A quality padded leg strap with a thigh cuff and a main belt attachment loop is the minimum requirement for comfortable drop leg carry of a loaded G40 over extended distance.
Conclusion
The Glock 40 is a purpose-built platform, and its accessories should reflect that purpose. For hunting and backcountry use, a quality MOS-mounted red dot, suppressor-height backup irons, a rugged Level 2 retention holster, and factory G20/G40 magazines are the foundation of a functional field setup.
A chest or drop leg holster configuration is better matched to the G40's role than any concealed carry rig.
The 10mm chambering demands more attentive maintenance than standard-pressure pistol calibers—recoil spring replacement on a shorter interval, regular copper fouling removal from the bore, and function testing of any trigger modification with hunting-grade ammunition are not optional on this platform.
The G40's discontinuation by Glock means parts and holster availability will narrow over time.
Stocking factory recoil spring assemblies, confirming that your holster maker still supports the G40 profile, and using factory magazines as your reliability baseline are the most practical long-term ownership steps.
Equipped correctly, the G40 remains one of the most capable hunting and field pistols ever made on the Glock platform.