Leave it to Kel Tec, to make some of the worlds greatest firearms, the model PS50 sets the stage of innovation. This pistol is chambered in 5.7 5.7x28mm and uses FN PS90 50 round box magazines. It fires semi automatic and there are a number of brace mounts to attach on the market. If you already have everything, make a little more room in the safe for this one. Additional information; Kel-Tec, P50, Pistol, Semi-automatic, 5.7X28MM, 9.6" Barrel, Threaded Barrel, Polymer, Black, Picatinny Rail, Ambidextrous Safety, 50 Rounds, Ambidextrous. Caliber: 5.7 x 28mm Capacity: 50 Rounds Barrel Length: 9.6" Trigger Pull: 5lbs Overall Length: 15" Weight Unloaded: 3.2lbs. We are a COLT authorized brick and mortar dealer in Arizona. Sales tax only collected for in store purchases made in Arizona. CREDIT CARD accepted 2.99% for non cash processing. Stock and pricing subject to change without notice. 7 DAY A WEEK PHONE INFORMATION HOTLINE 52O 790 5017