Unfired Mossberg 590R tactical package - Includes Hogue overmold grip, Sig Romeo 5 green dot, and Magpul PRS stock. 

Take your 590A1, give it AR-style safety and a flat trigger, and you have the 590R, which holds 7 in the tube and one in the chamber. 

Excellent tactical or home defense pump shotgun!

These go off the shelf for $1100 - Let me save you time and money!