SOLD!!! I have a Super Heavy Tungsten guide rod from the Glockstore. It's for a Glock 26/27/33/39. It's 16lb, weighs 3X more than factory plastic. It's for gen 1,2,3 and 4. Package says 1,2,3 but I read where it will work fine in a gen 4. Price at store was $70.00....will sell for $45 shipped.