During the 1960s heckler koch perfected the famous polygonal profile barrel technology conventional lands and grooves rifling allow propellant gasses to escape around the front of the bullet as it is fired from the barrel muzzle. The hk45 is a full size model pistol but significant effort went towards making it more ergonomic than the hk usp full size chambered in 45 acp by incorporating features found on the heckler koch p2000. In may 1995 heckler koch introduced a 45 acp variant the usp compact series was introduced in 1996 and is available in 9 mm parabellum 40 sw 45 acp and exclusively to the compact model 357 sig . Heckler koch hk45 compact tactical slightly radioactive last seal i talked to says they are still issued sig p 226s heckler koch have made fine weapons for years their only shortcomings are they dont listen to their customers and their customer service is a joke i tried to get an ambi safety for a usp compact 45 they
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