Walking into the shop , many shooters often wonder about the distinctions between the Glock 19X MOS , the standard G19, and the Gen 4 G19. The 19X MOS represents an evolution, featuring a changeable optic https://ruger-380318179.wikicorrespondence.com/7053832/glock_19x_mos_vs_the_g19_vs_the_gen_4_a_local_gun_shop_comparison