Laser Boresighter Simmons.

Simmons Universal Laser Boresighter for Rifle Scopes .22 to .50 Caliber Black, 510100C includes arbors for 22 through 50 caliber. It is ideal for helping you to get on paper before taking a first shot. A boresighter will save you money by allowing you to fire fewer shots while zeroing your scope at the range. Boresighter uses 3 batteries (included).