First off let me say that as my name implies, im a big fan of the Glock 20. If im working on the farm or in the woods, 9 times out of 10 my G20 is on my hip. I was looking at some Glocks the other day at my favorite gunshop, and over heard some folks talking bout the SF model Glocks, Heres my question, if the gun is an SF model, does it say so on the firearm itself? Does the sf have any drawbacks? Thanks for the help, i gotta go dispatch some piney wood rooters.