Bob, this is no different than any other category of firearms procurement.
You need at least four.
BTW - This is one of my favorite forums to visit because of the core group of guys that regularly contribute. Please know that while I also may disagree from time to time on this, that, or the other I always feel I'm in very good company even when in mid-HUFF....
It's all been fun for me here and I sure hope I'm not coming across any differently.
Y'all have a good night!!