Can anybody helpme. I have a airsporter mk6. I want to put a new spring and seal in. I have striped it down.It is the piston with the metal head not aluminium and an o ring seal. I want to know,which is the best spring to put in it, to put it between 11 and 12 foot lb. I have seen fancy kits with alot of messing about but they will take it over and i dontwant this.Also I want to smooth it out on recoil. Is there any seals in the pellet port. Any help will be a great help thanks in advance. Phil.