You can use metal guide rods, with factory springs, they won't hurt anything, or help anything either. I run them on my G17L and G34 because the nose cut out is only semi round and it's easier to get the metal one in. And contrary to popular belief I only replace the recoil spring when it gets too weak to close the slide. The G17 on the bottom has over 80,000 miles on it with no new spring.
Stainless guide rod in a LoneWolf G34 upper