Plastic guide rods in a Sig eh? Everything I've read says it shouldn't/doesn't make a difference. That's reading though and we all know what that's worth. Here's what I do know though. If I had a plastic guide rod in my pistol, I'd go find a metal one, lol.
Bedair is the link I have in my favorites for when I place an order for stainless rods. I've heard good things about his product and speed of delivery. Grey Guns makes a "fat" one (read his site for info). I'd never heard of the 2 Snak3 posted. They look like quality though.
220ST, P228, Two P6's