With over 20 design modifications from its Gen4 predecessor, the G19 Gen5 is proof positive that even the most refined polymer pistol in the world can get better. Among the most notable changes is the Glock(R) Marksman barrel with enhanced polygonal rifling that delivers a better gas seal and less fouling. The Gen5 preserves the reversible magazine catch of the Gen4, but goes one step further by incorporating a truly ambidextrous one-piece slide lock. That’s a nice upgrade for you lefties out there. The magazine and mag well have also been overhauled. The magazine now features an orange follower so you can visually identify empties, as well as an extended lip for grip. The mag well Mfg: Glock