Tissue test over the breach seal is the first test, if a piece of tissue blows off the breach area when a pellet is fired , that is the culprit of the loss of power, if not look into the spring and piston seal. -Thanks, I will do that. It is a spring gun meant to look like a Beeman Eliminator. Cocking feels the same. It smoked some at first and has continued some. The power has dropped steadily.I doubt it has 10 ft/lb of power. The stock is nice.
I suppose it could need a new piston seal........How many shots thru it?
Good chance it is a torn piston seal if power is that low.