Sorry for the delay...
POF hand guard off the Revolution DI 9.1oz
Charging handle 1.5oz
BCG 10.9oz ( I believe my mil-spec AR15 bolt carrier was about 11.6 ounces)
Carrier 8.6 oz.
Bolt 1.7oz.
Firing pin 9 grams (.3 oz)
Upper, w/o hand guard and I don't think I had the BCG in there either 4.21 lbs.
QD's on either side of the hand guard. These help secure the hand guard to the barrel nut. 18g or .6oz
Complete lower w/the original hand grip. I now have a Smoke carbon grip and V7 titanium grip bolt 2.13lbs
Stock 6.0oz.
Buffer 3.0oz
Buffer tube 118g (4.1oz)
Buffer spring, lubed

1.9oz
OEM grip and bolt 2.3oz
End plate 15g (.5oz)
Castle nut 17g (.59oz)
Finned barrel nut
Adjustable gas block. The gas tube is straight.
I think that's everything I have in terms of individual component weight. The only things I've found to swap out for lighter parts (and we're talking grams!) is the castle nut (probably the end plate but I like the POF version), the grip and grip screw. I'm sure you can drop in a lightweight trigger and go with custom safety selector switches (but not the shaft). Everything else is proprietary, like AR15 diameter but AR10 length sort of stuff. Take down pins are a no go. Tried a Smoke carbon fiber buffer tube and it's .75" too short. Not sure if they make a shorter buffer but I can't lock the bolt open with that buffer tube installed so it's now on my AR15. Could do a titanium muzzle brake and save an ounce. Haven't looked at the BCG with calipers, specifically the carrier, to see if it swaps with an AR15 carrier. The bolt is proprietary. Running a RCA titanium BCG in my AR15 with the POF roller pin, wonder if that's an option. The hand guard is fairly light. My Coda carbon hand guard, 13", is 7.5oz although that does include the barrel nut and trunnion. So yeah, doesn't get much lighter without a lot of exotic materials. If there were more standard parts and you swapped out things like the hand guard, take down pins, barrel nut, muzzle brake, trigger, etc...you could probably get it to around the 6 pound range. Not that I'd advise swapping any of those parts out though.