Quick view Magpul Magpul Industries Corp Sga, Magpul Mag490-gry Sga Moss 500/590 Stk $109.20 Made in the usa, the sga stock is an ambidextrous, user-configurable buttstock designed to add much-needed adjustability to the tried and true mossberg 500/590/590a1 12ga series of shotguns.Featuring a spacer system for length of pull adjustment,... Compare Add to Cart