I used my neighbors Laserlyte kit, and gotta say, it's was nice. It's not cheap, but does the job well. Took less than 15 minutes.
KRYPTONYTE LASER BORE SIGHTING SYSTEM, from LaserLyte.
First 3 shots were was in the 9/10 ring at 100yrs after following the simple instructions. I set mine up in my 2 stall garage, about 40ft accross or there abouts. I like the gun and scope level bubble, makes the whole thing quick and easy.