The HK HK45C .45 ACP 4.57" Tactical Barrel 51000982 is specifically designed for the compact tactical variant of the HK45, known as the HK45CT. This barrel features a 4.57-inch length with metric 16x1 left-hand threads, making it compatible with suppressors and other muzzle devices. The polygonal rifling and O-ring barrel system ensure exceptional accuracy and longevity. This barrel is constructed from high-quality materials and is designed to withstand the rigors of tactical use. The HK45C Tactical Barrel is an excellent choice for those seeking to enhance the performance and versatility of their HK45C in both tactical and everyday shooting situations.