The Top Gun for 3-Gun - Now Comes Optic-Ready. Patent-pending receiver cuts and a removeable cover plate allow direct mounting of Shield RMSc-pattern micro dot sights, for improved eye alignment and faster target acquisition. Inside every 940 JM Pro, you will also find a new durable gas system, specially-coated or finished internal parts for smooth operation, and a competition-level loading port, elevator, and follower. Outside, a user-adjustable stock and streamlined forend sport Mossberg signature texturing, while a host of stylized, functional components combine for competition - optimizing speed, accuracy, and durability.