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Glock 40 G4 MOS 10mm Auto 6.02in Black Nitride Pistol – 15+1 Rounds
GLOCK G40 Gen4 MOS Semi-Auto Pistol
Glock 40 Gen 4 MOS Semi-Automatic Pistol 10mm Auto 6.02″ Barrel 15-Round Black
The GLOCK G40 Gen4 MOS Semi-Auto Pistol is designed as a serious hunting, tactical, or competition handgun. The G40 shoots the powerful 10mm cartridge, capable of downing deer, hogs, and bear. The long slide reduces muzzle flip considerably to keep the user on target during rapid fire, and also increases sight radius. The G40 Gen4 MOS comes from the factory with a Modular Optic System milled into the top of the slide for mounting aftermarket reflex and red dot sights.
The MOS slide comes with a removable cover plate that fills the milled out area, and 4 brand-specific adapter plates and a hex wrench. The pistol also has a white dot front sight, and an adjustable white outline rear sight. A modular back strap allows shooters to instantly customize the grip to an individual shooter’s hand size, or to cold weather gloves.
The polymer frame utilizes GLOCK’s Rough Texture to provide a sure hold on the pistol in adverse conditions, and the enlarged magazine catch is reversible, accommodating left or right-handed shooters. An integral accessory rail in front of the trigger guard allows for the attachment of a plethora of aftermarket tactical flashlights or laser sights.
The GLOCK G40 Gen4 MOS Semi-Auto Pistol is an ultra-reliable, accurate and extremely controllable handgun, making it an ideal choice for outdoorsmen and competitors alike. Ships with three 15-round magazines.
Glock 40 Gen 4 MOS Semi-Automatic Pistol 10mm Auto 6.02″ Barrel 15-Round Black
Manufacturer model #: PG4030103MOS.
- Designed as a serious hunting, and tactical handgun
- Shoots the powerful 10mm cartridge
- Long slide reduces muzzle flip
- MOS (Modular Optic System)
- Ready to mount reflex sights
- Adjustable white outline rear sight
- White dot front sight
- Modular back strap
- Rough Texture grip frame
- Integral accessory rail
- 3 high-cap mags
Glock G40 Gen4 MOS 10mm Auto 6.02in Black Nitride Pistol – 15+1 Rounds – The G40 Gen4 in Modular Optic System (MOS) configuration is chambered in 10 mm Auto and combines a long slide and barrel for improved velocity with a high magazine capacity. The Modular Back Strap design and the reversible magazine catch let you instantly customize its grip to adapt to accommodate any hand size. The MOS Configuration makes an easy job of mounting a reflex sight on the pistol’s slide without the need for a new slide or separate mounting system.
- Modular Optic System Mount
- Modular Back Strap Design
- Reversible Magazine Catch
- Safe Action System
Glock 40 MOS
Capacity 15 Rounds of 10mm
The Glock 40 shares a full-capacity 15 round magazine with its shorter-barrelled Glock 20 sibling. 10 round factory magazines are also available for those in states with magazine capacity restrictions.
Glock factory sights are debated with religious fervor, with all sides making legitimate points about their strengths and inadequacies. The Glock 40 I tested was equipped with the basic white outline post-and-notch sights many Glocks come with.
For my eyes, they worked just fine. It’s worth noting that the Glock 40 is now available in MOS configuration to allow the fitment of a reflex sight, which will delight many.
Glock 40 Gen 4 MOS Semi-Automatic Pistol 10mm Auto 6.02″ Barrel 15-Round Black
Now, at last, Glock has come around to taking care of its handgun hunting fans with the release of the long-slide Gen4 G40 chambered in 10 mm, which has been lovingly dubbed Glockzilla by some enthusiasts. It’s no coincidence that this model arrived the same year that the company launched the factory installed MOS (Modular Optics System) for mounting reflex and red dot sights. The MOS feature is currently available on four Glock models including the G34, G35, G41 and the G40. I had my first opportunity to shoot the G40 at the 2015 SHOT Show, so I was looking forward to shooting it again for this review.
Glock 40’s Long Sight Radius
It quickly became apparent that the Glock 40’s carbine-length sight radius and the 10mm round’s nominal bullet drop made this gun ideal for working long distances.
At 50 yards, the biggest thing keeping me from punching holes in the 10-ring was flinching in anticipation of the recoil.
Even after 50 rounds, I still expected the gun to kick harder than it did. However, with some steady breathing and focus on the front sight, the Glock 40’s long barrel delivered the goods exactly where I wanted them.
A string of three bullseyes at 25 yards convinced me that the Glock 40 is excellent for learning to manage anticipatory flinching with more powerful cartridges.
Glock 40 MOS Maintenance and Parts
Glock handguns enjoy one of the most vibrant aftermarkets for parts and accessories. However, the Glock 40 is a bit of an outlier here. Some parts like the connector spring and the trigger assembly are shared with the .45 ACP caliber Glocks.
The Glock 40’s long slide and unique chambering mean some parts are unique to the 40.
Moreover, being a bit of an oddball Glock, it’s going to be a bit tough to source some of the aftermarket goodies like threaded barrels (although I note that KKM, a superb manufacturer of aftermarket competition Glock barrels, makes a threaded barrel for the 40).
Does Barrel Length Matter?
I already own a Glock 20 so there was an obvious opportunity to compare velocity numbers with the Glock 40. I tried both Magtech and S&B ammo in my buddy Justin’s chronograph. Here are the results:
The velocity change was not as pronounced as I was expecting. Moving up to the 6″ barrel of the G40 only added 68 FPS with Magtech and 45 FPS with S&B. I suspect that full-power ammunition would show more of a velocity increase than FMJ practice ammo.
When designing the G40 10 mm, Glock engineers followed the same design ideas used for the G41 .45 ACP. The polymer frame, recoil assembly, controls and 15-round magazines are lifted directly from the Gen4 G20 10 mm. The Gen4 features include the Rough Texture grip frame, 2″ accessory rail for lights and lasers, removable back straps and an enlarged reversible magazine release button. The polymer sights, consisting of a white dot front and windage-adjustable white outline rear, are a common factory option.
However, instead of just elongating the G20’s heavy-duty slide to accommodate a longer barrel (making the pistol unnecessarily weighty), a slim, thinner-walled slide with external dimensions comparable to the Practical Tactical models was installed. Even though the G40 does not have a cut out in the top of the slide, the pistol still weights 2.5 ounces less than the Standard size G21. The result is a 10 mm pistol with a much better balance in hand than one might expect from a long slide.
Glock 40 Gen 4 MOS Semi-Automatic Pistol 10mm Auto 6.02″ Barrel 15-Round Black
The G40 ships with the MOS Adapter Set 02, which is a package of parts containing four numbered optics base plates, screws and a small wrench. The pistol’s slide is milled, drilled and tapped to accept a removable plate located between the chamber and rear sight. This plate is contoured to match the shape of the slide when an optic is not in use.
Installing an optic using the MOS components is a simple process. Start by removing the magazine, locking the slide in the open position and verifying the pistol is completely unloaded. If you have a gunsmith’s pistol stand, you are ready to get started. If not, it will be easier to install the optic if you field strip the pistol so that the slide can rest directly on a flat work surface. Remove the contoured slide plate from the slide by loosening the two slightly longer retention screws using the provided wrench. Then select the correct optics base plate by pairing the plates with the optic until you find the right fit. Attach the base plate to the slide using the shorter screws provided in the MOS package. The slide is now ready for the installation of the optic. 
For this test, I opted to use the top notch Trijicon RMR 1.0 MOE Red Dot sight (RM09-700304) which arrived from the factory affixed to a clamping base designed to fit Picatinny rails. In order to mount the RMR using the Glock MOS system, it was necessary to order the Trijicon AC32064 RMR Mounting Kit so as to have the correct set of mounting hardware. So when selecting your optic, make sure to communicate with your product provider to ensure you have all the right bits and pieces.
The G40 arrives with a substantial set of accessories in addition to the MOS adapter set. Along with three 15-round magazines, a magazine loader and a tiny sight adjustment tool, there’s a set of four removable back straps with a retention pin and a punch. The purpose of these back straps is to help the operator adjust the grip shape and trigger reach to fit their hands. Two of the straps maintain the standard grip shape but increase the trigger reach by 2 or 4 mm respectively. The other two back straps also change the trigger reach by 2 or 4mm with the addition of an extended beaver tail to help protect the shooting hand from slide bite.
Glock 40 Gen 4 MOS Semi-Automatic Pistol 10mm Auto 6.02″ Barrel 15-Round Black
At the shooting range, the G40 demonstrated Glock’s usual level of reliability. I fed, fired and properly ejected every round of ammunition with no malfunctions during informal or formal testing. All of the controls worked properly with the slide locking open on the last shot and magazines dropping free from the grip when the magazine release was pressed. The trigger exhibited the typical love-it-or-leave-it Glock qualities with a slightly mushy take up and a distinctive click when the trigger reset.
I brought along the little wrenches provided with the MOS system and Trijicon RMR just in case any screws shook loose in the course of fire but none of them did. The RMR reflex optic was easy to sight in and provided for quick target acquisition. It doesn’t take long to appreciate why this sight system has become so popular for sporting and defensive applications.
As expected, the felt recoil produced by the pistol when firing a variety of 10 mm ammunition ranged from brisk to stout. However, the recoil was not painful or punishing even with the hottest loads. The elongated slide and other ergonomic features made the pistol controllable, and thus enjoyable, to shoot. Even though the 10 mm cartridge is not as popular as some semi-auto calibers, there is a good selection of practice, defense and hunting grade ammunition available from several different manufacturers these days.
Glock 40 Gen 4 MOS Semi-Automatic Pistol 10mm Auto 6.02″ Barrel 15-Round Black
While checking the pistol’s accuracy with bench rested 25-yard 5-shot groups, bullet velocity was measured by firing 10-shot groups next to a LabRadar chronograph to see how the 6.02″ barrel affected ammunition performance. Surprisingly, the extra barrel length did not produce as much of a velocity boost as I would have expected.
Armscor International produces a moderate recoil practice load topped with 180-gr. full-metal jacket bullets which has performed reliably for me in several guns. The average velocity when fired from the G40 was 1148 fps., which is statistically the same as the company’s listed velocity of 1150 fps. This round produced a best single 5-shot group of 3.09″ with an average of 3.29″.
The most accurate load was the Double Tap 125-gr. Tac-XP jacketed hollow point with a best single group of 2.74″ and an average of 2.89″. Flying along at a respectable list velocity of 1600 fps., this round also exhibited the greatest velocity increase of the test set with an average of 1685 fps. Federal Premium’s 180-gr. Trophy Bonded jacketed soft points turned in a best group of 2.75″ and an average of 3.01″. Velocity only increased a little, from a list speed of 1275 fps. to an average of 1289 fps.
The Glock G40 Gen4 is a pistol I’ve been waiting to see for some time. When the G41 .45 ACP was released I had my fingers crossed that there would be enough customer demand for Glock to produce a similar long slide configuration in 10 mm. The Gen4 frames fit my hands more comfortably than the Gen3 models and the addition of the MOS feature is certainly a plus. The timing of the G40’s arrival couldn’t be better. Finally, we can enjoy a reasonably priced 10mm long slide with the rugged reliability of a Glock without the need for expensive aftermarket parts or gunsmithing.
Specifications
Manufacturer: Glock; us.glock.com
Model: Glock 40 Gen4 MOS
Action: Safe Action
Caliber: 10 mm
Finish: Gas Nitrate Slide, Polymer Frame
Grips: Rough Texture, Multiple Back Strap System
Sights: White Dot Front, Adjustable Outline Rear
Barrel Length: 6.02″
Overall Length: 9.49″
Sight Radius: 8.19″
Trigger Pull: Listed 5-lbs. 8-oz., Tested 5-lbs. 4-oz.
Trigger Travel: ~0.49″
Height: 5.47″
Slide Width: 1.13″Inches
Frame Width: 1.28″
Accessory Rail: 2″
Weight: 28.15 oz. (Unloaded)
Capacity: 15+1 Rounds
Twist: 1:9.84” RH
Rifle Grooves: Hexagonal
Accessories: Hard Case, 3 Magazines, Magazine Loader, MOS Adapter Set 02, 4 Removable Back Straps, Back Strap Tool, Rear Sight Adjustment Tool, Cleaning Brush, Lock, Owner’s Manual
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