Magpul SGA Mossberg 500, 590, 590A1 Shotgun Stock is an ergonomic, highly adaptable design that allows a shooter to tailor the buttstock to fit individual needs and/or shooting styles. The SGA is customizable in many different ways, including Length of Pull adjustment from 12.5" to 14.5" in 1/2" increments via the included stock spacers, optional interchangeable cheek pieces (sold separately) and choice of integral, ambidextrous 1.25" sling loops that are recessed into the stock's sides. Additional features include a recoil reducing butt pad, ergonomic grip angle with anti-slip texturing, and reinforced polymer construction. For use with 12 Gauge Mossberg 500, 590, 590A1 Shotguns only.