The action 'clonks' from side to side when taking off or replacing the buddy bottle. This can be lessened by tightening the action bolt (which is OK length, Cheers Nick!), but still not ideal.
I have cut a business card into 4, and sandwiched 2 strips each side between the stock and action, one fore the other aft. This now holds the action firmly, but I can see no accuracy improvement on an indoor 35 yard range.
Again, I'll have have to wait for a perfectly still day to test at longer range outdoors.