Also running plated bullets with N320, runs very clean. Learned the hard way about coated bullets.
I have the spare parts kit from Inleadwetrust + a couple of spare pistons and gas plugs to swap and speed up cleaning time. Titanium firing pin.
I clean it every 1200 rounds or so.
I'll start seeing FTF when the gas system gets clogged.
I usually replace the recoil and ejector springs every year, ~5000 rounds