While no stranger to building pistols or working on the AR platform I’ll have to confess a bit of confusion when it comes to picking parts for an AR pistol build. My son and I would like to build an AR pistol in 5.56 from scratch and could use some advice on which parts to choose. A web search results in hundreds (if not thousands) of a dizzying array of lowers, uppers, barrels, BCG’s, etc. My initial reaction was to just buy a pistol and be done with it, but the kid insists on building one. Sooooo…...any suggestions on where to start?