All 940 Pro Waterfowl shotguns now come optic-ready, with patent-pending receiver cuts that accept direct mounting of Shield RMSc-pattern micro dot sights, for improved eye alignment and target aquisition. Inside, you will find a host of corrosion-resistant internal parts including a boron-nitride coated gas piston, magazine tube, and hammer and sear for improved performance in the blind, in the pit, or while reversing upland fields. For additional protection, their 940 Pro Waterfowl models feature a coated return spring tube, chrome-lined chambers and bores, and a stainless steel return spring to help when facing wet, unforgiving conditions.