Love the multi-caliber applications - SightMark Triple Duty Universal Laser Bore Sight

I've used caliber-specific laser bore sighters before, and they work well to help with initial sighting of the scope. However, you need to keep several of them around to fit your various firearms. Plus, you need to insert them into the chamber and then get them out. This consolidates your equipment into one piece, saving space in your gun cabinet for more important items. I've attached it to multiple weapons, threaded barrels, flash hiders, etc and it works as advertised. Pops on, pops off...how simple can you get?