For more than half a century, HK has been a leading designer and manufacturer of small arms and light weapons for law-enforcement and military forces worldwide. The HK 45 Semi-Auto Centerfire Pistol includes several user-inspired enhancements, including interchangeable grip backstraps for optimal fit, a military-standard 1913 Picatinny accessory rail, and ambidextrous fire controls. The HK proprietary, cold hammer-forged O-ring barrel offers a precise barrel-to-slide lockup for improved reliability and enhanced accuracy. HK's unique internal mechanical recoil reduction system reduces felt recoil by as much as 30% for improved control, while an improved safety and frame-mounted decocking lever delivers a positive stop and returns to the firing position after decocking for enhanced reliability. The stainless steel slide features aggressive serrations for improved slide manipulation, and is finished with low-profile drift-adjustable 3-dot sights, this handgun ensures intuitive target acquisition, ideal for new and seasoned shooters alike. Interchangeable grip backstraps Military-standard 1913 Picatinny accessory rail Ambidextrous fire controls Proprietary, cold hammer-forged O-ring barrel Internal mechanical recoil reduction system Improved safety and frame-mounted decocking lever Low-profile drift-adjustable 3-dot sights Front and rear slide serrations