I know that it's just built into them to allow them to operate in extreme conditions.
I've often read about it and heard others speak about it often.
I have had mine for 20 years and I really don't pay attention to it.
With that said I took mine apart for a deep cleaning today and started doing some research about it on YouTube.
I used Velcro tape on the pump slide and added a couple more pieces and have eliminated the rattle in my gun.
Below is the video explaining what I did.
https://youtu.be/2S_dxeI8T84Sent from my iPhone using Tapatalk