I've been looking at three boresighters - the traditional style Bushnell with the 15 spuds, Leoupold magnetic, and Site-Lyte laser. The Site-Lyte seems to be the easiest to use and the Loopy more complicated. However, I'm a little partial to the Bushnell because of no batteries and electronics to break but the Bushy"s metal spuds in the bore may not be good for the rifling.