Both the Gamo "Extreme" and "Hunter" line of Air rifles claim a manufacture FPS (Feet Per second) of 1250 FPS with Lead and 1650 FPS with .177 PBA pellets.
Now here is the truth you should know.
Don't confuse speed with accuracy or power. Most any air rifle that fires a pellet at 1200 FPS or better can obtain a speed of over 1600 FPS, simply by firing a light weight pellet and that is what Gamo PBA pellets are, very light weight.
Light weight pellets are subject to cross wind and easily drift off target. Here is an Example, a .177 Gamo PBA Pellet weighs 5.4 grams while a H&N .177 pellet weighs 10.65 grams. The H&N pellet will not fly near as fast as a Gamo PBA pellet, But it will fly straighter and have considerable more knock down power than the GAMO pellet.
A $2750 Olympic Feinwerkbau air rifle fires a match grade pellet at 500 FPS. This may seem to be slow, but it's dead accurate, and Olympic shooters understand accuracy.
Also remember air guns/rifles are also made in the following calibers with each one slower than the previous, But look at the size. The last one fires a pellet as large as your thumb and is capable of bringing down a Boar or Deer. The sizes are: .177, .20, .22, .25, .357 Cal, 9MM, 45 Cal, and 50 Caliber.
So don't confuse "Speed" with "Accuracy or Knock Down" power.
A magazine
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?
The cast of O gamos - 1984 includes: Dimitris Katalifos Pemi Zouni
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.
.223 Winchester Super Short Magnum
Yes. Air travels faster in liquid if you compare it to a solid. Air travels the fastest in gasses.
Do you mean an air Rifle? NO, Not in the United States.