This is a bit off topic but I think relevant. I have a Sig P239 that came new with a plastic guide rod. I'd say that after 200 rounds the rim of the rod started to show significant wear (deformation) and after about 500 rounds it no longer appeared functional. I was pleased to receive one made of steel when I ordered new. Apparently Sig was not happy with the performance of their plastic guide rods.

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I'm gonna grow fins.