Sold This is a brand new heavy-duty tungsten guide rod assembly for Glock 29, 29SF, 30, 30SF, or 36. It has the standard factory weight 17 lb. spring. It came from the Glock Store, and they say it will work in Gen 3 and Gen 4 pistols. $50.00 Call or text Five-Zero-Three-Eight-Zero-Seven-8789. I live in Tigard.