It makes a great SBR starting point. I bought my p556 for that purpose. Did my paperwork and then when stamp came back added the swiss stock and welded on a diopter. Gun pretty much looks like a553. I'm not shelling out 5k for a real one. If rather plunk 5k toward a Barrett.50.Thinking about possibly selling one of my 556 ER rifles to fund a P556.
Anyone have any regrets/dislikes about their P556? Or P556xi?