Quote Originally Posted by dfrosch View Post
Yeah, it takes a few tools to assemble an upper. Got the Magpul BEV block, a YHM hand guard wrench, a RRA stock wrench and a Wheeler pivot pin install tool.

That pivot pin spring and detent got several quality flying lessons.
Pivot pin tool? You don't need a tool for that, you just need to learn how to tilt your head and stick your tongue out just right while assembling.