Del-Ton makes good stuff, and their customer service is supposed to be top notch. The upper will come already assembled. As for tools, I just put my first lower together with a flat head screwdriver, punch set, a small hammer, and a CAR stock wrench. Make sure to get some tape also so you dont ding your receiver during a few steps. Oh, get the Pivot Pin install tool. For what, $5 its well worth it.