Notable differences between the G20 Gen 5 MOS (top) and G20 Gen 4 (bottom) include the frame, grip, and optics mounting options. Tyler Freel Although the Glock G20 Gen 4, and other Gen 4 Glocks, have ...

The model number, in this case “19,” was originally ... and the barrel is Glock’s enhanced Marksman component. The “MOS” stands for Modular Optic System and refers to the slide’s ...

Many who don’t like Glocks complained that earlier versions of the Glock 19 were too thick; the Gen 4 addresses this problem ... The pull is listed at 5.5 pounds. The pull is somewhat mushy.

Many who don’t like Glocks complained that earlier versions of the Glock 19 were too thick; the Gen 4 addresses this problem ... The pull is listed at 5.5 pounds. The pull is somewhat mushy.

The MOS models are Gen 5, with optic platform cutouts already milled ... which gives better accuracy. My Gen 3 Glock 19 is pretty accurate, and, unless one steps back another 100 yards or so ...