Boresight info/kit needed

Just sighting through the bore is not an option?


With a bolt gun it works fine, but with an AR it's a bit harder unless you want take the upper and then block it someway and boresight with the naked eye. I've never tried it, but it seems like a bit of trouble if can insert laser cartridge and bench the weapon out 50 meters from my bedroom to the far wall in the living room. Of course I'd have to take some shots with it after words to confirm the zero, as usual.

My vision is so poor I can't see down the bore of a .308 let alone a .223.