Originally developed as part of the U.S. military's Joint Combat Pistol program in 2005-6, the HK45 Tactical model is the threaded barrel variant of the HK45 and comes standard with a threaded barrel and adjustable Truglo high profile sights that are suitable for use with or without suppressors. The sights are made exclusively for HK.The full-size HK45 Tactical (HK45T) model uses an ergonomic grip design that includes changeable backstraps together with molded finger grooves that instinctively position an operator's hand for optimum shooting.