I have a P250 in .45 and it has the "plastic" rod. I have shot over 1000 rounds and there apears to be little to no wear.
He does not list one for the 250 but he can make them. Not sure of the cost but I would guess $50-$75.
I will eventually get one.
By the way, there is a forum just for the P250Sig. I actually found this forum after being a member there.