Most air gunners would send their rifle to a custom shop. Where the spring is polished or replaced. The spring tube is also polished and better seals are installed. Usually the trigger is reworked.
most of these are things that require special tools.
See the link below for different shops.
no
No.
An Air Rifle is either a BB rifle or a pellet rifle. It uses air or gas to propel the projectile.
No
A sporter air rifle and what?
Are you asking how do you swap and air tank on an air rifle, or swap for and air rifle? In most air rifles you put it on safe and swap out the tank by unscrewing it and replacing it.
can i ship air rifle to trinidad and what i need
When you say Air Rifle you are referring to a pellet rifle not a firearm. At present there are no 300 Cal air rifle being made.
Only if the scope is designed for an air rifle. Because of the recoil being different on an air rifle than a firearms rifle. Air rifle scopes are made differently than firearms scopes. A firearms scope can break it's glass mounts if it is used on an air rifle.
Physically, it could be done. Highly doubtful it would be worth it to do that, rather than to buy an existing air rifle. Legally, a new receiver would have to be used - BATFE law dictates "once a machine gun, always a machine gun".
Do you mean an air Rifle? NO, Not in the United States.
An air rifle fires a projectile (usually a BB) using compressed air instead of an explosive charge.