rattiling noise in Walther LG 300

[dhiru]

I own a Walther LG300. And all of a sudden I have been hearing a rattling noise emitted from the regulator area after shot release.

The rattling noise occurs only when fired with a pellet. I do not hear the sound during dry fire or if the air-rifle is shot empty without a pellet.

Any help towards solving the problem will be greatly appreciated.

Many thanks,

Dhiru.