Glock 20 Gen5 MOS 10mm Auto 4.61in Black Nitride Pistol - 15+1 Rounds - The standards of performance and reliability can’t be beat now with the option to add an optic to the new G20 Gen5 MOS. All of the Gen5 qualities are present in this compact-size pistol: The latest GLOCK nDLC surface finish on the major metal components, unmatched in hardness and rust resistance; the high traction Gen5 frame texture, quickly reversible magazine catch, ambidextrous slide stop lever, the GLOCK Modular Backstrap System (MBS) for individual operator adjustability, the universally-acclaimed GLOCK Safe Action System and high visibility orange magazine followers.