Don't skimp on a head space gauge. Get at least a no go gauge and check it what a live round. Do you have the fixture to hold the trunnion inside of the receiver to place on the press? If not, just another think to think about. You should be able to get away with using a 6 ton press. I have used the screw rod method and that has worked for me. For the pins that holds the barrel in the trunnion, the rear and front sight block and the gas block, you will need a 7 mm, 4 mm, and a 3 mm drill bit.