Originally Posted by Drakker
An expensive way to zero in your scope?
Give the man a cigar!
Actually its combined with a laser bore sighter for accurization projects in airsoft. Gundocs can bench a high powered gas gun or AEG and turn off the hopup, load the mag with these - then boresight with the laser to get to paper. Then finish off with single round shots until you're zeroed. A perfect BB with perfect balance eliminates any possibility of ammunition inaccuracy influencing your 'area of probability' that you shoot on when you shoot an AEG or gas gun. An AEG is closer to the dynamics of a smooth bore shotgun than it is to any kind of center fire rifle system. You always want to shoot down the center of probability, that way your grouping is statistically the tightest it can be.