Glock unveiled its new Modular Optics System, or MOS, on Gen 4 models G34, G35, and G41 — and a long-slide 10mm Glock, the G40 at the 2015 SHOT Show.
While those stumping for a Glock single-stack 9mm didn’t get their wish at this year’s SHOT Show, the Austrian company nonetheless delivered its impressive Modular Optics System (MOS), an optics-ready configuration on several popular Gen 4 models, and one hell of a handgun for 10mm fans: The G40—a long-slide 10mm also with the MOS option.
“Our research has prompted us to release the MOS configurations for the G34 Gen4, G35 Gen4 and G41 Gen4 and the new G40 Gen4 in the MOS Configuration.” stated Josh Dorsey, VP at GLOCK, Inc. “The new GLOCK MOS platform offers a convenient way to mount reflex sights without costly alterations to a warrantied slide.”
Best Starter Kit for Concealed Carry:
Disclosure: Some of these links are affiliate links. Caribou Media Group may earn a commission from qualifying purchases. Thank you!
The MOS models include an Adapter Plate Kit containing 4 adapter plates as well as the tools for the removal and installation for a variety of optics. Optics are not included with the MOS pistols. Right now we know the system works with reflex-style sights from Eotech, Docter, Insight, Meopta as well as the Trijicon RMR, C-More and Leupold Delta Point.
Glock suggests you can take a play from the AR world and use extra-high rear sights, to co-witness with a MOS-mounted optic. Certainly the system has in mind tactical competition applications where speed acquisition is key, but many concealed carriers are adopting and using small red dots as well.
The specifications for the Gen4 MOS configured G34, G35, and G41 are the same as their respective non-MOS versions.
Glock 40 10mm
This one got my attention, for Wisconsin’s hunting regulation has long required handgun barrel length to be a minimum of 5.5 inches (as measured from the firing pin to the muzzle).
This has always been easy business for revolvers with 5-inch tubes, thanks to help from the extra length afforded by the cylinder. However, for semi-auto work, Badger State Glock 20 hunters needed to buy aftermarket barrels, which work well enough but stuck out the end of the slide—making them look … odd and cobbled. Sure, they work, but it was a look I never could warm up to. Now, with the G40 10mm, the length is sufficient to keep the authorities happy and send the .40 cal. bullets screaming down range.
The Glock 40 MOS looks good and packs a heavy payload. It sports a 6-inch barrel and carries 15 rounds of the powerful 10mm cartridge. It can be outfitted with any number of reflex style sights that mount directly to the top of the slide, no custom machining required.
G40 Gen4 Specs
Caliber: 10mm Auto
Overall Length: 241mm/9.49in
Overall Width: 32.5mm/1.28in
Barrel Length: 153mm/6.02in
Mag Capacity: 15 rounds