Best boresight - Concept Development Corporation Site-Lite SL-100 Mag Laser Boresighting System

Wasted plenty of money on gimmicks that I won’t name shame here but finally went with this SL-100 and it is by far the most accurate of the many I have tried. Really should have bought this to begin with. Followed the instructions to the tee and I was on paper and only had to adjust a few clicks at the range. I will definitely recommend this specific model from now on. For reference I zeroed my S&W M&P Competitor with a Holosun 507 Comp green at 15 yards for USPSA.