ProMag FNHA13 20rd 9mm Fits FN 509 Blued Steel

The ProMag FNHA13 is a 20-round extended magazine designed for the FN 509 9mm pistol, offering increased capacity over standard 17-round magazines. Constructed from heat-treated steel with a black oxide finish, it features a chrome silicon wire spring and injection-molded follower for reliable feeding. Made in the USA, this magazine provides an affordable, durable option for range training and self-defense applications.