Buy Glock34 Gen 5 MOS Online The Glock34 Gen 5 is Streamlined in design and built for long-distance shooting, the Glock 34 Gen 5 for sale glock 30 gen 4 for sale makes the ideal competition or duty pistol. Chambered in 9mm, this striker-fired handgun has the Modular Optic System (MOS) onboard ready to accept a red dot sight and features Gen 5 enhancements including the Marksman barrel, an ergonomic grip without finger grooves, an ambidextrous slide stop lever, and a tough nDLC finish.