For those who seem confused this thing isn't ment to give you zero at 100 yards. Its a tool to put you on paper. If sighted in at 25yards you can easily see the dot. This will then put you on paper at 100 yards pending your caliber.
If you want a precision laser sight or bore sight that can zero you in its going to run you closer too $300 not $30
Pros: Gets you on paper!
Cons: It is what it is.
This review was written in the old system and had content requirements that are different than reviews written today.