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
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.
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.
Yes it is a major sin in the sight of Allah to purchase or sell liquor.
Almost any Combination BB & Pellet rifle is smooth bore. BB rifles usually are Smoothe bore. The Crosman model 760 is such a rifle and can be purchased at most sportingood stores. Look at the packaging and it will say Smooth bore. Smooth bore barrels are less accurate than rifled bore barrels. Cabelas, Basspro, Big5 and Sports Authority usually carry them.
One can purchase front sight for a gun in websites that sell gun apparel, accessories and equipment such as FrontSight, Guns4Survival, NewEnglandCustomGun and other outlet gun stores all over the world.