Davidson Defense is one of the few brands out there that have lower quality parts than Anderson Manufacturing. I've removed a few of their parts, and I can report that the QA/QC as well as the materials are horrible.
Many of their rifles have improperly torqued parts, undimpled barrels, and questionable materials.
Had someone bring me one of their free float hand guards to install on a rifle. The barrel nut was drilled wrong and none of the holes would line up with any of my wrenches. Had to put it on the press and drill out a few of the undersized holes in order to put the wrench on it. Good thing the barrel was already seated.