Aim Sport's Red Laser sighting tool is a quick and easy way to save time and money sighting in your weapon. Now it's as simple as chambering a brass sighting tool that's identical in size to your weapons caliber. Red laser light aligns with bore and projects the exact postion of the center of your bore on target. Scope or Iron Sights can be adjusted to align on the same spot and your ready to remove the brass alignment cartridge and finish sighting in with live ammunition. No more wasting time and wondering where shots are impacting and using a box of shells trying to get on target. This alignment cartridge is designed for 45 ACP.