This FN 509 is optic-ready and features an ambidextrous mag release, an ambidextrous slide lock/release, optic-height night sights, and a threaded barrel with thread protector. Purchase includes the original box, soft case, manual, one 12-round magazine, one 24-round magazine, optic plates, and a backstrap. Get the best bang for your buck when you get a Certified Used Firearm. When you see the Certified Used stamp on any of our firearms, you can be confident that you're getting exactly what you want - a gun only in very good to excellent condition and held to the highest quality standard. All Certified Used Guns come with a 'no questions asked' return policy.