Have used this kit on an AR build and also for replacing a barrel. As long as you have access to a vise, this kit provides just about everything you need and the parts are built solid. Only problems I encountered were with the multi-tool. The 3/4" cut-out for flash hiders is too small (about 0.65") and the buffer tube lock nut wrench was too large. Using painter's tape solved the latter, while using a normal 3/4" wrench solved the former, but defeats the point of the multi-tool, which is a shame because it's one of the best constructions I've seen for them. Otherwise, this kit is wort the money considering the torque wrench, upper vise block, and magazine well block.
Pros: Solid parts, very useful selection
Cons: Multi-tool not very multi-useful
This review was written in the old system and had content requirements that are different than reviews written today.