First you have to understand that the B3 is made in China. There is an old saying, "No two Chinese airguns are alike" You could get a real dog or one what was serviceable. But a good one puts out about 10 FP, usually less.
This Chinese air rifles shoots about 615 FPS. This is average for this type of air rifle.
Not designed for that type of improvement
Not recommended. Not desgined for a more powerful spring.
It all depends on who made the air rifle and the power plant that the rifle uses.
1 pound of air is equal to approximately 0.08 pounds of water. This is because air is much less dense than water, with air having a density of about 0.075 pounds per cubic foot and water having a density of 62.4 pounds per cubic foot.
Only if the scope is designed for air rifles. Regular firearm scopes are made different than air rifle scopes and many will break if used on an air rifle because the recoil is different than a firearm.
A pressure foot is used to measure air pressure inside a tank. This means that every square foot of the tank, there is a pound of pressure.
Very Powerful!
An Air Rifle is either a BB rifle or a pellet rifle. It uses air or gas to propel the projectile.
A sporter air rifle and what?
No
no, if your gun is below the legal muzzle velocity which is 12 ft/p/lb [12 feet per pound of force]