GLOCK 40 MOS 10mm Auto, longslide, size matters.

Glock 40 MOS 10mm Auto review

GLOCK, in my opinion, stepped up their game SHOT show 2015 with the GLOCK 40 MOS in 10mm Auto. If you have been reading rangehot any at all or know me even a little, you will know I love the 10mm Auto as much as a man can love a cartridge.

You can see my 10mm Auto ballistic test using the GLOCK 20, 10mm Auto by following this link. The 10mm Auto teetered after the FBI abandoned it for the .40 Smith and Wesson but due to a few manufactures’ insight, such as GLOCK , chambering their pistols in the powerful cartridge, the 10mm has taken hold.

My GLOCK 20 has been boringly reliable since I bought it but, always looking to experiment, I bought a factory 10mm Auto six inch barrel for my G20 and begin to experiment with the chronograph and ballistic gel. There were noticeable gains in velocity and that translated into better ammunition performance in ballistic gel. That was well and fine but the pistol looked a bit odd with that 1.6″ of barrel sticking past the slide.

So, someone sitting in the GLOCK think tank was reading my mind and WHAM! there was the GLOCK 10mm longslide at the 2015 SHOT show. In addition to the longslide, GLOCK incorporated their MOS system. MOS stands for Modular Optic System and has been included on several of their pistols. The MOS system allows you to mount popular optics to your pistol via a pre-machined recess at the rear of the slide. Using one of the five included adapter plates and a two Torx fasteners you can mount your optic without having to remove the rear sight or have any machining work done. If you choose to run your pistol with iron sights, it ships with an insert matched to the slide that fills in the recess. Currently the adapter plates can accommodate Eotech, Doctor, Insight, Meopta, Trijicon RMR, C-More, and Leupold Delta Point. The instruction manual tells you which plate for which sight.

The longslide adds more benefit than just esthetics. With a longer slide you have a longer sight radius and that helps a great deal with a proper and more specific sight alignment. If you handgun hunt, many states require you to have at least a six inch barrel. So, if you plan to hunt with your GLOCK, why not take advantage of the added sight radius along with the added velocity and accuracy?

I put in a request at SHOT for a 40 MOS test sample due to the fact it was everything I like about GLOCK and 10mm packaged in a single pistol. When it was released to distributors I got my test sample. I immediately took it out and ran a few magazines through it and compared it directly to the GLOCK 20 with the six inch barrel. The 10mm Auto does have a sharp recoil but is manageable with proper technique.

Here is one of my students shooting her GLOCK 29, a subcompact 10mm Auto and these are for real 10mm Auto loads, so you see, even in a subcompact the gun can be controlled.

With that said, the longslide helps tame the recoil, and now with the Gen4 pistols shipping with optional backstraps for a more custom hand fit and pick of a beavertail size it certainly turns a controllable pistol into one that is plush to shoot. You can see there is plenty of real estate on the slide. Accessory rail is standard on this as all full size and compact GLOCKs since the third generation. I think accessory rails are a solid option but on a pistol such as this that would be ideal for hunting or trail protection, a rail is a must.

What it comes with, not shown is the lock, instructions, and standard polymer case. You can see the other backstraps, the two spare magazine, magazine loader and the four adapter plates for optional optics. Though GLOCK includes a single Torx L shaped wrench that fit the included screws, I would get a nut driver in that same size and use it over the included wrench. There is also a small flat head screwdriver for the adjustable rear sight.

Rear GLOCK sight adjustable for windage and elevation. I can also be drifted in the dovetail. You can see the filler plate in place here just above the cocking serrations as well as the backstrap I favored of the options.

The Gen4 GLOCKS have updated stippling, a little more aggressive but still comfortable. Also as with Gen4s the magazine catch is interchangeable from left or right.

The trigger broke, on average, just under five pounds. It seemed little improved over what I was used to with GLOCK, but it is still a GLOCK trigger. My biggest complaint was the slide stop did not have provisions to be released with your thumb. GLOCK makes a factory slide stop with a shelf for thumb and that is always the first thing I change. If I were to change one thing, it would be the slide stop. With that said, the slide stop worked as it should, even with the Gen3 magazines.

I ran a few magazines through the pistol to get a feel for it and then went to the twenty-five yard line for some accuracy testing. Once that was over, I got a pile of factory rounds and my favorite 10mm reloads and went to the range to really wring out that pistol.

The GLOCK 40 MOS detail strips just as any other Glock. Easy as pie.

Range day.

Accuracy chart, 3 rounds fired from a rest at 25 yards.

My buddy Jay trying out the 40 MOS.

Conclusions

The GLOCK 40 MOS, as all other GLOCKs I have experience with, is reliable and employes the same manual of arms, but that is about where the similarities stop. Compiling the already popular MOS system with the integrated accessory rail, and the six inch barrel with the already proven platform of the GLOCK 20 you get a 10mm Auto pistol with the same capacity but increased velocity, sight radius, and the option of easily adding optics. Now the GLOCK 20 is a bit large for concealed carry and with the increased slide length, the GLOCK 40 MOS would not be your ideal concealed carry platform. That being the case, this pistol was not designed for that, but really shines for handgun hunting, either primary or backup. I also see it as an ideal pistol for trail or camping defense against two and four legged predators. The Gen4 GLOCKs ship with three magazines so you have plenty of backup magazines right out of the box. As you saw in the video, the GLOCK 40 MOS fits nicely into holsters for the GLOCK 20 with an open end, or at least that was what I found with my couple leather and Kydex holsters. As you also saw, about the middle of the video portion of the review, I shot a local tactical match with the GLOCK 40, and even though I was not completely familiar with the new pistol I placed in the top five out of about twenty-five people, so not bad at all for my first run with a brand new pistol. You don’t have to worry about making power a factor with the 10mm Auto as well, and to me it is easier to shoot than many pistols in .45 Auto. So with adding a red dot and a few modifications I could see this pistol as an excellent match pistol. With all that you see here, I believe GLOCK hit a home run with the 40 MOS.

Redfield Accelerator red dot sight mounted, the Accelerator is not readily compatible with the MOS system but I was sent one to review and with the included Accelerator plate the sight securely mounted. This will give you an idea of what the GLOCK 40 MOS looks like with a red dot mounted. So far that red dot has worked well but that review has just began.

Specifications

Length/Width 9.49 in./ 1.28 in. Sight Radius

8.19 in. Height

5.47 in. Barrel Length

6.02 in. Weight unloaded 28.15 oz.

Trigger pull and travel 5.5 lbs.-0.49 in.

Barrel twist and rifling right hand, hexagonal/ /1 turn in 9.84 in.

Magazine capacity 15 rounds

Acknowledgments

GLOCK

Hornady

37 PSR Gun Club

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