The PF-9 retains the best features from Kel-Tec's P-11 and P-3AT pistols, combined into the flattest and lightest single stack 9mm configuration ever made. The PF-9 is a semi-automatic, locked breech pistol with the length, height, and exterior controls of the P-11 and the shorter trigger system, integral hammer block, and extraction system of the P-3AT. The rear sight is a new design and is adjustable for windage with the supplied allen wrench as well as for elevation with the use of shims (not included). The included 7-round rectangular magazine is supplied with a finger extension base plate and numbered holes. The under-barrel accessory rail shares the dimensions of the MIL-STD-1913 picatinny rail although there is only one locking notch in the forward position.