Both of the above are correct.
I'll add that unless you have a good bit of knowledge in basic machining and metal working, don't bother with these kits. They are not as simple as the catalog makes it sound. These "complete kits" are basically parts pulled from a bin and packaged. You will find yourself fitting every piece and that's a real pain in the ass.
In general, you should beware of catalog kits. Standards and quality will differ. So just because an AR is normally a "drop in" build, does not mean that's what you'll get when buying from a particular place. You might be getting factory seconds that are slightly out of spec. And in my experience, that's normally what you're getting from Sportsmans Guide.
If you want the satisfaction of building it yourself with little hassle, spend a few bucks more for quality parts from a specialty source.