This FN 509C features an ambidextrous mag release, an ambidextrous slide lock, co-witness height night sights, a threaded barrel with protector, and a Holosun HE507C-GR optic. Purchase includes the original box, soft case, manual, two 12-round magazines, one 24-round magazine, a backstrap, and an extra recoil spring. 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.