The Optic-Ready 940 Pro Tactical Autoloader. This 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" of LOP flexibility; t Mfg: Mossberg