[Danke]

I've heard of some folks pouring silicon caulking in where the hopup chamber meets the inner barrel. Others will shim the spring that pushes the inner/outer barrel together for more pressure

Now on mine I found the outer barrel was being pushed forward.

On the outer barrel there are 2 grub screws that hold the inner barrel in place. I took those out and found a longer set. Then I took 2 of the decorative screws off the outside of the receiver, you'll know which ones when you look. I threaded the longer bolts through the receiver into the outer barrel to pin it all together. Then I put the outer screws back in place and no more movement.