LWRC PSD
LWRC PSD Pistol and the IC-PSD are both semi-automatic 5.56 NATO caliber, pistols manufactured by LWRC International. Another PSD, (the SIX8-Pistol) is a 6.8mm Remington SPC on the same PSD platform. Design details 
The gun was designed to be a personal security detail pistol. The LWRC pistol accepts a 5.56 NATO cartridge. It has a  barrel and weighs  pounds. The gun has the short-stroke gas piston system. The barrel has a 1:7 twist and is treated with Black Nitride. Operation 
The PSD is an AR-15 style pistol which uses the same platform as the AR-15. The platform allows uppers to be switched and the lower receiver is the same specifications as the AR-15. It is fitted with LWRCI's flip-up iron sights and the controls are ambidextrous. The gun has MIAD pistol grip and the trigger pull measures 7.5 pounds. Because of the way the gun can be easily concealed, it is used by security details. References

5.56 mm firearms
Semi-automatic pistols of the United States
LWRC International semi-automatic firearms
Short stroke piston firearms
2006 introductions
6.8mm firearms