The LCT Sr-3m I purchased and posted recently shoots 330 with a 2fps variation, good trigger response on a7.4 lipo. I can't fault the gearbox and if I wasn't going to change it completely I'd leave well alone.
my well used LCT AKM just has parts replaced when they wear out (which hasn't happened yet after 33,000 bbs) so I got bored and changed stuff anyway because I can't help myself.
Unless you get unlucky I would say you can't go wrong with LCT as a manufacturer,
dont need an LCT vss vintorez, really want one
dont need an LCT 9.5 key mod AK, really want one
dont need an LCT G3A3, really want one
really don't need an LCT PKP, really, really, really want one and so do you if you want any kind of support weapon