I finished the lower for the gray compact. Took a minute. The lower parts kit was from Brownell's, for $44, and everything went together just like it should have. It'll be a minute before I can get the upper on it, though. The lower parts kits for the other two are on their way, based on the test of this one.
That magwell from Farrow Tech is good. It only secures through the back, and it moves a little on the frame, if you wanna make it move. Once you put a MagPul mag in there, though, that magwell is solid, and doesn't budge at all at the front. I'll put two more of those on the other two frames, and at $20 each, you can't beat that.