Look elsewhere. This thing is the biggest waste of money I've ever spent. Although stable in the bore, the laser will move if it is spun...even when fully secured, you won't know exactly which "spot" is the right one. Complete waste of time and money. I'm getting one of the "bullet" types...at least I know it'll be representing the bore accurately.
Pros: Multiple calibers
Cons: Doesn't hold zero
This review was written in the old system and had content requirements that are different than reviews written today.