Something I forgot to mention last night. Here's a picture of 2 different screw heads used by Kreg. The one on the right, is for a 1" long coarse thread screw. The one on the left, is a 1.25" coarse thread screw.
You can see the different size heads between the 2. In order to get the screw heads not to stick out the back side of the bottom rail, I had to use the 1" size. I prefer the 1.25" when I can, because it gives me a little more strength in both pieces of wood, but, hey, once the glue dries, the screws won't be doing all the work anyhow.
