Quick and easy barrel/caliber conversion; Proprietary recoil attenuating system; Proprietary multi-caliber magazine allows the use of 3 calibers, 7.5 FK, 10mm, and .40 S&W; Textured, ergonomic frame provides a secure and comfortable grip; Integrated optics mounting platform compatible with most leading brands; Rapid acquisition sight system does not require adjustment within the range spectrum; Sights shoot to aiming point up to 100 meters with the 7.5 FK caliber; Picatinny rail for easy mounting of accessories; Slide charging handles