Tbh mate the 80 (depending on age) should be a sweet shoot if you just strip and relube/deburr, also a 20 quid TBT kit will have it running like a venom glided version. I find giving the trigger a good strip clean and polish a massive help on performance of the 80. As we speak I have my own trigger unit and a friends in front of me now ,about to get stripped cleaned and polished,