Guarantees you'll hit the paper, it did - SSI Sight-Rite Deluxe Laser Bore Sighter for Pistols, Shotguns and Rifles

Follow the directions, it did as it was supposed to. I've had mine for 5 yrs, sighted in several different cal's close enough for fine tuning and confirmation shots, to include a 22 cal. bolt, open sight with some imagination and no additional equipment, was perfect for gopher head shots at 25-50 yds.
Pros: universal
Cons: can't seem to find extra casing kits for add'l calibers

This review was written in the old system and had content requirements that are different than reviews written today.