Here are a few I like and use. All available from Brownells
I will use part #'s so you can just input them at the Brownell's website to see them.
1) 231 000 007 dpms combo wrench. Mine had to be fiddled with to work.
2) 080 216 015 brownells combo tool, very well made.
3) 702 003 015 brownell's vise receiver fixture.
4) 795 015 100 brownell's vise barrel jaws, you don't really need this unless your going to remove the barrel extension.
5) a good strap wrench, you can get that at Sears and lot's of places.
6) if your building stripped lowers this is a great tool. 100 003 308, pivot pin and spring with detent installation tool.
This will get you started, some roll pin punches, cup tipped punches are nice.