I mentioned that I had picked up an AR-10 Armaspec lower parts kit with an FDE selector lever and magazine release button. I've now installed that in the lower receiver. I have to say that I really like the shorter throw--I think it is a 45 degree--on the safety selector lever.
The trigger is a BCM PNT Trigger Assembly. I wanted a trigger that used mil-spec type parts for ease of locating parts or repair should something go wrong. Bravo Company has polished the trigger, applied a nickel plating and Teflon coating which makes the trigger very smooth.
The backplate, castle nut and buffer tube are standard AR parts--I used the Aero Precision brands, but there is nothing special about them.
I can't find the packaging, but the buffer is a shorter AR-10 buffer (you can't use an AR-15 buffer because they are too long) and a flat coil spring intended for the AR-10/AR 308 rifles.
Total weight of everything you see in the photograph, including the stripped upper, is 2 lbs 6.6 ounces according to my scale.
I still have some parts to collect for the upper.