I finally finished the CavArms Lower, with a little 5/64" pin needed to hold the buffer retainer down. Since the Cav Arms Lower Receiver doesn't have a buffer tube, it needs a little pin to hold the buffer retainer down in it's hole. I learned this the hard way, but I think I made a last minute save and did it the right way.
Of course, I had to buy 36 of the pins from Brownell's, so I have plenty of spares.
I've function tested it, but I haven't shot it yet.
As of right now, I have everything to build it except the lightweight barrel from DPMS, which is still backordered. Can't do much without that.