Very nice. I've thought about getting a NiB BCG but have yet to pull the trigger. Do any places sell just the carrier without the bolt?? I've got a nice LMT bolt that I would want to keep.
Yes I've seen carriers minus bolts, but not Aero (ballistic advantage does sell what i assume are Aero bolts though minus carriers)...
Not sure I think its a great idea to mess with such for no good reason though. If you run into a tolerance stacking issue for instance - ie no good way to know timing is exactly the same on an Aero versus LMT bolt/carrier. It should be but 99.9% of the time these things remain a matched set.