This issue has been raised on forums and some people have resorted to a bit of wood reworking or shimming as necessary in order to stabilise the action. Owners may understandably not be keen to do this themselves with a new gun, not least because other issues may come to light which necessitate a warranty return. I owned a HW100T without any problems, although frequent reports of air leaks and accuracy problems do come up on forums. Barrel quality seems variable (this unrelated to the specific issue of a batch defective barrels lacking fully threaded muzzles which HW addressed). I much prefer the AA S400 - not relevant to the question asked, I accept.