I have a Progressive Machine Titanium BCG. This is a super light, super strong custom high dollar carrier group that Jerry Miculek ran in his AR-15's.
This one was test fired and then put away for a 3 gun build that never happened. I have a couple of AR's I'm building let me know what parts you have. The bolt carrier alone is worth $350.
Or I'll sell outright for $250 shipped.