for your stock or aftermarket spring will do it.
most of the gamos i have had crazy twang, the guide set took care of it.
with the stock internals you have to use alot of lube to quiet it.
JK's Airgun Forums, moderators, and administrators are not responsible for any problems that may occur from reading or using content posted on this forum, as they are the exclusive responsibility of two parties: the person who posted it and the person who acted on said posted information.Use of our forums by people under 18 years old is allowed only with legal guardian(s) present.