It's the same guide rod. Optical illusion. Try placing yours curve down and look at it from the same angle on something white while squinting and reciting, Sig, Sig, Sig..........
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Source for the asymmetrical one was from Sig's website, on the listing for it on their online store:I've never seen or heard of any type of asymmetrical guide rod for the P238. Pretty sure that picture is just messed up or at an odd angle. Care to share the original source link?