Got this last week, it looks like a sleeper guy has owned it a while & not been shot. Anyway i found the power was creeping up, so decided to strip it, never having done one before, fair bit of preload on it, & 3 weights in the piston, is this normal ?, gun doesn't seem to have been apart, everything was very tight. There is some slight play in the spring when in the piston should i make a sleeve & if so is an ally can ok to use ?

Thanks for looking,

Rob