Hi does anyone know how to remove the adjustable stock on the brocock commander xr so I can adjust the hammer spring and get my gun shooting closer to the UK legal limit at the moment it is shooting jsb 10.3grain pellets between 9.10 and10.2 foot pounds , I I use the gun mainly for shooting rats and a few rabbits out to 30yds and it has despatched them cleanly but would feel better shooting rabbits closer to the 12foot pound limit, i could send the gun back to brocock but thought in our present situation whith the lock down it will give me something to do and would like to maintain the gun myself ,thanks for any help and information and please stay safe