This comprehensive kit features a .223 green boresight, 11 precision-engineered arbors, a convenient carry case, and LR41 batteries, making it the ultimate accessory for shooters looking to sight in multiple firearms. The arbors are CNC machined and meticulously designed for ballistic and schematic accuracy, covering over 20 calibers within a single kit. Say goodbye to the hassle of purchasing separate laser boresights for each gun. Simply unscrew the backing of the arbor or hollow brass piece, insert the .223 green laser boresight, reattach the arbor backing, and insert it into the chamber. Close the bolt to activate the boresight and easily align your optics—all without wasting valuable ammunition! This kit is perfect for both seasoned shooters and beginners, ensuring efficiency and precision in sighting in your firearms.