The HK45CT (Compact Tactical) is the compact tactical variant of the HK45, chambered in .45 ACP with an 8-round standard magazine capacity (10-round extended magazines available). It features a 4.57" threaded barrel (metric 16x1 left-hand thread) with polygonal rifling and O-ring barrel system. The overall length is 7.91", height 5.51", and unloaded weight of 29.12 oz. The pistol includes raised tritium night sights designed for use with suppressors, and a Picatinny rail for mounting tactical accessories. Like other HK tactical models, it includes advanced features such as a modular grip backstrap system, ambidextrous controls with extended slide releases and magazine release, and HK's proprietary mechanical recoil reduction system. Available in multiple trigger configurations (DA/SA and LEM variants), the HK45CT incorporates HK's hostile environment finish, multiple internal safeties, and enhanced grip texturing. The compact tactical design makes it particularly suitable for special operations and law enforcement units needing a more concealable suppressor-ready platform while maintaining the reliability and accuracy of the full-size tactical model.