Don't we hear about this all the time? As it stand now is there anything that will act the same as lead? Gold does, and it has a higher ballistic coefficient than lead. Not at all practical cost-wise, lol. Copper is okay, but expensive. Most of the evidence I've read regarding lead shot and poisoni...
I think the issue is dry firing, which can break the pin probably a result of corrosive ammo from a surplus one. There are aftermarket pins that are much stronger that fixes that issue. I think there's a decocking issue too with that model too. It's a nice shooter though.
At least with a surplus stock (which is shorter in length) I go as far forward on the stock to the receiver while sighting, and don't experience the stock slapping.