I use a BSA bore sighter. Tried the laser ones and chamber ones but didn't like any till I picked up this one. Brownells has the extension for them so you can even sight in a Cemte or H&K rifle with no problems. The range finder I use is a Leo and so far so good. Picked up both for just over 250 if memory serves maybe a bit less.
Maricopa Shooting Service
S.W.A.T. South West Airsoft Tactical
NRA Certified Instructor