Sounds like an early Sirrocco like Mine, safety pull switch in front of trigger guard, Long Anschutz barrel with barrel weight on end,
The smaller Gas ram inside not the H.E. Ram which is in the EVO's and is harsher to fire, And a bit of a scope wrecker.
Mine is a 1985 .22 model which just gives a nice quick jolt and away the pellet is launched.
atvb Daz 7.