It kind of depends what you want to do....but this is my "kind of expensive but will make your life easy" list.....I cant think of any action you couldnt perform in terms of basic building/assembly with this
-Good Barrel Wrench---Smith enterprises combonation wrench is hands down the best one i have used. All the others broke (dpms twice)
-Good upper vise block---I think the PRI ar15/ar10 product hands down takes the cake. There are other polymer ones that can do a good job too.
-CAR stock wrench---I have one from RRA, but they all seem to get the job done the same
-Bright orange brownelss FSB pin removal/install jig (this makes removing and installing FSBs a breeze!) well worth the money. FSB removal/install can be done without it though
-Good set of various size punches for pin install/removal. Copper is better, i use steel ones though.
-Heavy duty strap wrench- for installing FF tubes. Fabric has held up better than the rubber belts for me
-Front sight adjustment tool- Can be accomplished with a bullet, but the actual tool saves frustration (tons of places have these....be sure to specify A2 for your app.)
-Solid shop vise! Self explanatory
-Front pushpin retaining spring installation tool....not necessary, but saves headaches from chasing errant springs around on the floor. got mine from fulton armory.
-Allen key set, or flathead screwdriver (depends on how your pistol grip is attached)
-Small hammer
-Rubber mallet
That should be a pretty complete setup for taking it completely apart and putting it back together.
I get basically all my tools from BROWNELLS.com
The PRI vise you can get direct from precision reflex industries, or from WES@MSTN amongst others.
hope that helps....dive in!
John F.