The KRISS Super V Recoil Mitigation System uses an innovative nonlinear operating system that revectors energy down and away from the shooter's shoulder to dramatically reduce felt recoil and muzzle climb. This system allows the shooter to recover faster"" for quicker and more accurate sequential shots. An extremely low bore axis compliments the KRISS Super V Recoil Mitigation System by aligning the barrel with the user's arm. This allows the user's body to work together with the KRISS Super V System for maximum control. The latest generation of KRISS Vectors are capable of changing calibers to user's preference. Tool less disassembly lets users quickly change between caliber lower receivers in a matter of seconds. The KRISS Vector is designed to use the reliable and ubiquitous standard Glock(TM) magazines. Allowing you to share the same equipment and makes it easy to adopt into any system or load out. The KRISS Vector SBR comes with a standard threaded muzzle for the option of attaching your favorite muzzle device or suppressor. Use your favorite red dot or optic of your choice with the MIL-STD 1913 Picatinny top rail. The 13"" top rail gives you the flexibility to use any size or length optic of your choice"" so you can zero in on your target.