Still active? Also, my rifle.

I personally wouldnt waste my time with the gamo pellets, you would be lucky to hit the side of a house with those pellets. I would go out and get H&N field target and use those.

The triggers on the gamo are crap. not much you can do with those except replace them with a off market trigger such as the GRT3 triggers. I do make replacement triggers for them but they are a little more expensive than the ones you get from overseas due to the fact i hand make them to suit the rifle.

You will probably find the rifle sounds  louder than it actually is due to the plastic stock up against your cheek and you can here all the sounds of the piston and spring (or Gas ram) going off when you pull the trigger.

You might want to get a mate to fire the gun and stand next to it and see how loud it really is. But to answer the question, yes it will get quieter to a point as time goes on but not by much. 

Hi Steve, the best thing you can do is put pellets through it to settle it in. Next would be to try different pellets, as your barrel may like one pellet, but not the next. JSB, H&N, accupel, just a few of the range.

If you get keen, you can tune your gun by taking it apart, smoothing any rough factory edges, re lube, and there is more, but that often makes it nicer straight away. The trigger is another key thing. If it's a bit rough, getting to know it will take longer.

Enjoy.