The Smith & Wesson G19 Gen5 MOS in a Green/Black package is a popular choice for Shooters. This Subcompact pistol features a Durable Lightweight frame and a Melted Steel slide. The MOS (Modular Optic System) allows for easy Attachment Glock G19 Gen5 MOS Black/Green of a variety of Aiming Devices, Improving your Target Acquisition. Factory Options