it sells for around £169.95. see the link below.
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.
300 fps or 320
The Marksman BB 2020 Buddy rifle is rated at 300 FPS
If you are talking about the Daisy Air Force Rocket Command Rifle, it was made in 1959 only If this Rifle is in excellent condition it is worth about $300
It all depends on who made the air rifle and the power plant that the rifle uses.
it all depends on the condition of the rifle.
in general 180 $ is the minimum for a reliable rifle.
What condition is it in..
Don't put as much air in the rifle. If you have a dial to set the power then use it. As you shot the power drops. You can dry fire some PCP air rifles.
An Air Rifle is either a BB rifle or a pellet rifle. It uses air or gas to propel the projectile.
I am a little confused by your question. Do you mean Webley air rifle. I know that Wembly makes scopes but I am unaware that they make air rifles. If you mean Webley then I need to know the condition and the model of the rifle to give an estimate of value.
A sporter air rifle and what?