Bore sights can be purchased from outfitters such as Cabela's, Gander Mountain and Dick's Sporting goods, or online from store such as Midway USA or Amazon.
Purchase a laser-bore sighter kit and follow directions. Very simple and you do not have to fire 1 round.
A zero deflection is the adjustment of a sight, parallel to the axis of the bore of the gun to which it is attached.
There is no restriction on age for a sight in the USA.
I own over 50 airguns and rifles. I use a Laserlyte bore sight to initially sight the rifle. They make a sight for .177 to .22 Cal and a .22 to 50 Cal sight. It fits in the end of the barrel. Make sure it's snug when you adjust it and remember to remove it before you fire the rifle. see http://www.laserlyte.com/Laser_Bore_Sighter/LBS-1722-140/index.html
To sight in a rifle scope without shooting, you can use a bore sighting tool or a laser boresighter. These tools help align the scope with the rifle's bore, allowing you to adjust the scope's reticle without firing any shots.
A laser bore sighter shines a light down the barrel of a rifle so that one can adjust the sight. They are available at any gun shop, or at any hunting supply store such as Cabelas.
One can learn how to sight a gun without firing it by practicing with an unloaded gun, using a laser bore sight tool, or seeking guidance from a professional instructor.
Requires specialized equipment available at most gun shops
Requires specialized equipment available at most gun shops
The line of sight of the bore of the firearm is tilted up. When the bullet leaves the barrel, it is traveling up, and will fall back through the line of sight.
A collimator is used to "bore sight" a scope. It will help ensure that the scope is close to being properly aligned.
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