Bushnell Magnetic Boresighter 470001C 

Bushnell Magnetic Boresighter 740001C

Revolutionary boresighter design eliminates the need for arbors. Magnetically attaches to the muzzle for a super quick sighting in. Works on all calibers and firearms. Etched glass reticle. Easy to use. Just attach to the muzzle, adjust the reticle to the center of the grid pattern and go to the shooting range. Use less ammo to get your firearm sighted in. Compact design. Boresighter comes with instructions and carry pouch.