The FN 510 MRD carries 10mm Auto at the ready, giving you the stopping power you need to face any threat. Its made for pinpoint control red dot-ready, with a crisp trigger and unrivaled ergonomics. Featuring Low-Profile Optics Mounting System, Precision-tuned trigger, enhanced grip frame, optic cut slide, MIL-STD-1913 rail and Driftable steel sights co-witness. Includes two interchangeable backstraps, two magazines, four MRD mounting plates, owners manual, locking device and zippered case.Specifications: Action : DAO Caliber : 10mm Auto Barrel Length : 4.10" Capacity : 15+1 Rounds Grips : Black Textured Polymer Sight Configuration : Driftable Steel Co-Witness Frame Finish : Black