Hey there, ive had my s6.5 for since February and when i got it, it didn't make this squeak sound. Its nothing to do with the pump stroke as ive tried to find out what it may be. It only happens when i auto trigger, so i dont know what is up with it. Ive read online that its just part of the break in process but several of my paintball buddies got a ccm recently as well and theirs doesn't do it. Any ccm owners run into this? SOO annoying.