Here is a used in Ufired condition Mossberg 590A1 chambered in 12 GA. This example has a Davis M500 speed feed stock! 

The Mossberg 590A1 is the most durable of our pump action shotguns, meeting MIL-SPEC 3443G, with its heavy-walled barrel, metal trigger guard and safety, clean out mag tube, and Parkerized finish. Its hearty construction and proven endurance make it a prime choice for home defense applications.