Developed to meet the specifications of the Cordian National Guard (the nation-wide police force, not "national guard" in the american sense), the Castle Arms International PT-790 is a Double Action Only, striker-fired, polymer-frame handgun. The frame is made of CAI's patented high-impact polymer, re-enforced with carbon steel, and the slide is made of high grade carbon steel as well. The frame has a clear polymer insert that allows the user to quickly check their remaining ammuniton, a feature requested by the National Guard. It is a gas-delayed blowback weapon, similar to the HK P7, and as a result is very accurate, with remarkably tame recoil. The weapon has three safeties: a manual safety, an automatic firing pin safety, and an integral trigger safety. On Military and Law Enforcement models, it also has a fire select switch on the slide, which can cycle between semi-automatic, two-burst, and full auto. All of the controls, including the slide release, are ambidextrous. The pistol has elevated, adjustable partridge sights for use with a suppressor or slide-mounted red dot, and the military model has a ported barrel to allow for more controllable automatic fire. The backstrap is interchangeable, and the weapon can be fitted with a backstrap that allows the mounting of a stock. The weapon has a NACO STANAG 1913 PCAP mount under the barrel, and can be provided with a light, laser or foregrip.
The weapon is offered in a number of calibers: 10x22mm NACO (16+1), 9mm Luger (18+1), 7x22mm WBJ (16+1) and 7.9x24mm "Nathair" (20+1)