This Mossberg 940 Pro model comes optic-ready, with receiver cuts that accept low-profile direct mounting of Shield RMSc-pattern micro dot sights for improved eye alignment and target acquisition (a cover plate is included for when an optic is not in use). Inside, you will find a durable gas system that allows for up to 1500 rounds between cleanings, and a host of corrosion-resistant internal parts/finishing (nickel boron-coated gas piston, magazine tube, hammer and sear); plus an enlarged/beveled loading port, elongated elevator, and anodized follower for smooth operation. Outside, the adjustable stock allows for 1.75 in. of LOP flexibility; the stock and streamlined forend feature Mossberg signature texturing for a secure grip; a barrel clamp provides accessory flexibility via M-LOK mounting slots; and a front fiber optic sight helps keep you on target.