Benjamin vaporizer problem

My neighbor was going to throw it away. Had been using it to shoot tree rats offf his deck and said it suddenlly had no power. When you cock it it doesn't have enough power to even push the pellet into the barrel.

When you cock the gun, does it take some force to cock it, or does the barrel just swing down with no effort?

When you pull the trigger after cocking it, does it feel like the piston pushes forward? Or does nothing happen at all?
 
Not familiar with this ( i assume break barrel ) but if it do go " twang" when you pull the trigger, then its power generating parts are working, and we have to focus on the power ( air pressure ) generated by the spring.

This could be the piston in the rifle itself, but more simply it could also be the O-ring that are around the hole where you insert the pellet.

My friends PCP rifle gave up last summer but it was just the O ring ( inside the barrel ) that seal on the pellet probe to make sure air pressure go forward together with pellet.

I heard it go as his rifle changed sound, and before he could go WTH ???? i said to him try 1 more shot but hold your hand over the magazine, if you feel a puff of air there when you shoot it is your breech O-ring that just blew.
The quick fix for him was to go and take the barrel from my old FX rifle ( Cyclone )that are interchangeable with his FX rifle ( Cutlass ) , he have been shooting that ever since as he have not gotten a new O-ring.
Fumy thing both rifles are from 2012 and have been idling a lot in the years since then, mine was actually bought first.
 
If it's a Nitro piston rifle, safe guess is that nitro piston is bad and just needs replaced, Not hard to do and Crosman sells them for about $15. Also never hurts to replace the factory piston seal while you're in there.
Plenty of help to be had here in the Traditional Rifles Gate and YouTube for videos on how to do things.
 
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It takes verry little effort to cock. When trigger is pulled it make a very quiet sound almost like something moving slowly inside.

Definitely sounds like the piston has gone bad. Like a other poster said, you can order them from Crosman for pretty cheap. I would grab a piston seal as well and take the opportunity to learn how to do maintenance on a break barrel.
 
Found this online:

When you try to cock the gun does it feel like there is no resistance to cocking, have you tried to pull the trigger and see if it shoots?

Pull the action out of the stock, should be three screws, two on either side of the cocking slot and one in the rear of the trigger guard, watch that you don't loose the little roller on the cocking lever and the slider under the cocking lever and the little metal diamond shaped piece on the rifle where the screw from the trigger guard goes through.

Look to see if the cocking arm is actually in the cocking slot, look to see if the piston has twisted and is not catching on the sear or if it is stuck on the sear and not releasing?