With sorbo tech and advanced piston designs now, the issue of higher FPS=lower durability is totally gone. Only reason to go under 350fps now is if you use your gun inside and out, or if you're using stock parts lol
Prometheus or system(not systemA) super core piston, prometheus gears, sorbo cylinder head. You can run 1500rpm at 380fps and 100,000 rounds later the piston rack still looks like new.
And the whole mentality of the "sacrificial part", usually the piston, is completely gone now. It was necessary back when nothing was reliable, but I've seen more broken bevels and pinion gears caused pistons breaking and jamming the sector gear than anything else.