Very simple and useful tool - Sightmark Laser Bore Sights

I used this bore sight in my new AR15. This little guy helps to get you in the ball park before you hit the range but don't expect too much from it. The bore sight has a tiny bit of play in the chamber but still helped to get on paper first shot. The only real complaint I have is there is no power button. You have to insert the batteries to turn it on and remove them to turn it off. So I have to store those tiny batteries and hope I don't lose them.