If your refering to the lazer range finding scope, I have not fired one, but I have tried ranging with one. It turned out to be junk and it got sent back to burris. It hasn't returned after 3.5 months.
It ranged all over the place, I picked out a pick up truck and ranged at 80yds, put the scope down and ranged again a couple min. later and it was 120 yds. neither of us had moved an inch.
