Hi there, maybe i can help a little bit. I changed my spring and put a spacer between spring and piston, what a different story!!!!!! at 90 Feet(with scope) i was still able to kill a mice, i am using Beeman hollow point after trying out a hole sort of different pellets, they work the best for me so far. If you want some info on the spring and spacer i will mail you the order info from the 2 different places i got my stuff from. If you read up on some of the answers in the forum, there are some good ideas about noise reduction amoung some folks, good luck bye for now Michael