Features 1. The 22 inch to .50 inch RED BORE SIGTER is lightweight and easy to use. It comes with 8-piece hole adapters to fit calibers 0,22 to 0,50. 2. This aiming collimator installs in the barrel of the firearm and displays a red beam from the center of the hole axis, providing a precise reference to zeroing the target. Simply select the caliber adapter and place the device in the barrel. Long aiming range; 3. Lightweight and durable. It enables quick and accurate zeroing of any sights. 3. Allows you to check the telescope setting at any time. It allows you to quickly and accurately reset any type of sight. (iron, optical, holographic, etc. ). 4. Simply select the caliber adapter and place the light unit in the muzzle. Allows for quick and accurate reset of the sight. 5. Specification Material: T6061 aluminum alloy Color: Black Size: Approximately 166x18mm Diameter: 4,2 mm Power: andlt; 5MW Adjustable adapter with 8 holes Suitable for calibers 0,177 to 0,50. The range without adjustment is more convenient and accurate. Battery: 1 x CR2 battery How to use List of packages 1 x Red Aligner 1 x Screwdriver 8 x Adjustable Adapter 2 x Screw 1 x CR2 battery 1 x Plastic Packaging