RE: lazer bore site
Forget about all of that mess. To bore sight a rifle all you have to do is open it up so that you can see down the bore. Lock down the gun in a shooting vice or rest it so that it won't move. Center a distand object in the bore and then adjust your scope to the object also. Now you are bore sighted.
Even if you buy one of those expensive lasers you will still have to shoot the rifle to get sighted in. No matter how accurate the bore sighting device is or which method you use the bullet will 99.99999999999% of the time not shoot to the same place as your crosshairs are set from bore sighting.