The gun comes with a “ cover” plate installed which fills this gap completely, so at a glance, the Glock 17 MOS Pistol looks like a regular Glock 17 Gen 4 model handgun, except for the visible seams.Įven the slide serrations extend to the cover, so the feel will be the same as a standard Glock when the cover is installed. The slot is just about two inches long and maybe 3/16 inches deep if you remove the cover or mounting plate. The Glock MOS models come from the factory with a slot milled out of the top of the slide just forward of the rear sight dovetail. With that said, there are some obvious differences. So if you carry them all and add one in the chamber, that’s 52 rounds of 9mm ammunition, certainly enough to give Emperor Bloomberg heart palpitations. The Glock 17 MOS Pistol comes with three 17-round magazines and the standard Glock magazine loading tool.

The MOS has a sight radius of 6.61 inches versus 6.49 with the Glock 17 Gen 4.Īpparently, the rear sight is set just a hair farther back on the slide to make room for the optics mount cutout. In fact, the only difference I can see is in the sight radius. According to the published specs, the barrel in the MOS is also 4.49 inches long.

Overall length is 7.95 inches, width is 1.18 inches, and height is 5.43 inches. From everything I can tell, the dimensions of the Glock 17 Gen 4 and Glock 17 MOS are identical.

Glock 17 mos gen 5