PRODUCT DESCRIPTION PRODUCT SPECIFICATIONS FN 510 MRD 10MM BLK 10+1 407C Manufacturer: FN Finish: Black Model: FN 510 MRD Holosun Rate of Twist: 1-in-16" Barrel Length: 4.1" Caliber: 10mm Color: Polymer Frame Black Polymer Polymer Frame UPC: 845737018252 Action: Striker Fired Capacity: 10 + 1