It depends on the model. Each model is slightly different. Some models are 30 inches long and some are over 40 inches long. The longest one I know of is the Benjamin Super Streak that measures 49.75 inches long.
You should not leave a air rifle cocked for longer than is necessary to shot it. Over time the spring will deform it it is left cocked for a long period of time.
Are you sure it's not a Benjamin air rifle. I know of "NO Jefferson air rifle company", But Benjamin air rifles have been around a long time. If so what is it you want to know.
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.
Unfortunately their is no master record of every model air rifle made by model number that is compiled into one list. You will have to give some sort of description of the rifle. Is it a spring powered air rifle or C02 or Pump? Is it made out of wood or plastic? It is a BB or a Pellet air rifle. How long is it? About how old is it? Does it have any markings on it other than the serial number? Is it a multy or single shot rifle? without more information it is not possible to answer your question.
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.
It all depends on the rifle the size of the barrel and the load in the bullet. .22 Bullets come in stubby, short, long and Mag.
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.
An air rifle fires a projectile (usually a BB) using compressed air instead of an explosive charge.