Aim Sports Mossberg pistol grip and stock is a drop-in upgrade for your 12 gauge Mossberg 500/500A/590 pump shotgun. Its ergonomic pistol grip design fits comfortably in the hand and the M4 style stock is adjustable for length of pull, making the kit perfect for any shooter. The grip is constructed of polymer with an ambidextrous sling loop and the stock features a 6-position adjustable aluminum buffer tube.