There may be a few pieces of plastic in there somewhere, but they are still primarily brass and wood. For all I know they may be entirely plastic free (not counting the rubber rings) but that would be a tall claim to make these days and I don't have one to prove it with.
I got the pump pistol about two years ago and it's still just like years ago with new polyurethane on the walnut grips. No plastic that I've found thus far. I'm happy with it.
My two cents is that the Sheradin is still the best buy in a pump up.