When the rifle is cocked, a spring is compressed. Pulling the trigger releases the spring, which pushes a piston forward, The piston compresses air as it moves. The compressed air blows the BB or pellet out of the barrel.
Yes Diana RWS rifles are still made. See the link below.
What condition is it in. That determines the value.
You have to swing the forearm to pump up an air cylinder in the rifle. Usually it take about 8 pumps. When you pull the trigger it releases the air an propels the BB or Pellet.
Get a GR3T trigger for it. It is considered the very best trigger available for Gamo. See the link below
All pellet guns use compressed air or gas. 1. Spring piston: Cocking the barrel of the rifle compresses the spring and piston inside the rifle or gun that is located in an air cylinder. When you pull the trigger it releases the spring and as the spring shoots forward, it pushes compressed air ahead if it that forces the pellet out the barrel. 2. Co2: A Co2 bottle it inserted into the gun or rifle, and it is full of compressed Co2. When you pull the trigger a burst of Co2 gas is released and the gas pushes the pellet out the barrel. This same idea is used for the larger PCP rifles only they use a much higher pressure bottle. 3. Pump: When you pump the forearm of the rifle it stores air in an air chamber. When you pull the trigger all the air is released behind the pellet forcing it out the barrel. BB guns work the same way.
What condition is it in. That determines the value.
If there are any they usually are on the barrel close to the loading breech or above the trigger.
See the Crosman link below.
Your best bet is to look on the web for "air gun repair" and find a location to repair it for you.
BB guns have 3 different power plants. Spring, C02 and Pump. 1. Spring power: When the rifle or gun is cocked a spring is compressed inside a piston and released when the trigger is pulled. The piston pushes air ahead of it forcing the BB to fly out the barrel. 2. C02: C02 gas is contained in a cylinder. when the trigger is pulled a burst of C02 gas is released and forces the BB out the barre 3. Pump: When the rifle is pumped using the forearm, air is stored in a cylinder inside the rifle. when the trigger is pulled the air is released forcing the BB out the barrel. There is one more power plant but it is used in High power air rifles and guns only and that's PCP. Air is introduced into the rifle with a scuba tank taking the pressure up to 3000 PSI and is used to power the rifle for several shots.
Their are 4 common types of air rifle power plants. Spring power: or Nitrogen piston power. this uses a large spring inside an air piston tube; When the barrel is cocked (Commonly called a break barrel rifle) the spring is pushed back in the piston chamber and locks. A pellet or BB is loaded. When the trigger is pulled it releases the spring, forcing the piston forward in the air piston chamber, Compressed air fires the pellet out the barrel. C02: a C02 cartridge is loaded into the rifle and acts as a small air chamber releasing some C02 each time the trigger is fired. Eventually the C02 is used up and has to be replaced. Pump power. simply you pump the forearm on the rifle and it fills an air tank. When you have enough compressed air you fire the rifle PCP: Pre Charge Pneumatic: This is a large air tank inside the rifle. It is charged with a bicycle pump or scuba tank. It's like an oversized C02 tank inside the rifle. Again each time the trigger is pulled the tank releases a burst of air behind the pellet to fire it out of the barrel. This type of air rifle is usually a very high-powered rifle.