Glock 17 Gen 4 MOS – it’s over 35 years old now and the legendary Glock 17 (so named because it was the 17th patent procured by the company) attained iconic status a while ago. Since its introduction, the company has introduced a bevy of other models. Various frame sizes and a mass of calibers but the G17 chambered for 9 x 19mm Parabellum, remains the Glock that comes to mind when mentioning the name. The G17 in MOS configuaration (modular optical system) allows mounting of popular optical sights without costly custom machining of the pistols slide. Optical sights are popular in competitive shooting and are becoming increasingly popular for use on personal defence weapons due to fast target acquisition and faster follower up shots and transition between targets.
The GLOCK 17 Gen 4 MOS Configuration is identical to the G17 Gen 4 except for the machined slide that accepts an optical sight. MOS stands for Modular Optic System. READ MORE HERE . Essentially the top of the slide is machined about 48mm long in the Glock factory. Subsequently this slot then has a cover plate fitted into it. The result is that the frame looks indistinguishable from a standard G17 Gen 4 at first glance.
As a consequence the site installation is simple. Firstly you unscrew and remove the cover plate, position the new plate ( four plates are supplied to fit the most common optics) designed for use with your optic and screw it in position. Thereafter attach your optic to the plate with screws, as per you sight manufacturers instructions. Finally you’re good to go. If you own a MOS and decide you don’t want optics, you don’t have to use optics – just put on the cover plate and use with the standard iron sights.
Glock 17 Gen 4 MOS Rough Textured Frame Surface
This more aggressive, non-slip surface provides a more secure grip and better traction. For quite a while, some Glock owners had been getting custom texturing on their pistols to get what is now standard on Gen4 models
Glock 17 Gen 4 MOS Replaceable Backstraps
The Glock Gen 4 MOS has two insert options, medium and large or you can leave the pistol as is, in small or what Glock refer to as short frame configuration.
Glock 17 Gen 4 MOS Magazine Release Catch
The enlarged mag release catch is now easily reversible to either the left or right side.
Glock 17 Gen 4 MOS Magazine
The Glock 17 Gen4 MOS Magazine now features a pair of notches that will allow positive operation with all types of existing mag catches.
Glock 17 Gen 4 MOS Recoil Spring
The Glock G17 Gen 4 MOS has a dual recoil-spring system that features a progressive spring rate reducing felt perceived recoil.
Calibre – 9mm para Mag Capacity -17. optional 19/31/33
Weight Unloaded -705g
Barrel length – 114mm
Size (LxWxH) – 202x32x139 (without sight)