I'm one of those upgraded sears people, bought my VSR off someone at my old local site in 2006, still has 20 year old upgraded sears and mosquito mold parts 😂 Only thing I've changed in my ownership is longbow guide rings, maple leaf hop unit and rubber and a new bolt handle.
I could replace everything for new but at that point I might as well just buy one second hand that's has everything done and save myself time and money.
It's not consistent and fps sometimes varies ~30fps between shots but it soldiers on and has never let me down so I'll use it until it dies then it'll become a wall hangar. The M190 I bought around the same time has also soldiered on and only last month the piston lid shit itself mid game, have had far more issues with newer guns tbh.