Chambered in 9A-19 the G48 MOS features the GLOCK Slim Mounting Rail for mounting tactical accessories and incorporates elements of the Slimline series such the short trigger distance a frame with a built-in beavertail a reversible magazine catch and the incredibly accurate match-grade GLOCK Marksman Barrel (GMB) of the Gen5 series. The G48 Rail also features precision-milled front serrations. The slim magazine has an orange magazine follower for higher visibility and is specifically developed to ensure the 10 round magazine capacity. Note: The G48 with the Modular Optic System (MOS) does not come with adapter plates.