It's too bad you're having trouble getting ahold of the guys at Craddock. They chambered a 6.5CM heavy Bartlein for me and I think it shoots really good. Especially for a gas gun. It easily holds well under 1 MOA out to 600 (farthest my range goes) and I had no problems making hits on 2 MOA steel at 1000 as long as I got the wind call right.
I'm shooting 130 ELDMs at around 2910 using Superformance and Starline brass.
I used Aero for my upper, lower, handguard and BCG, but replaced the bolt with a JP enhanced bolt and had Craddock headspace it to the barrel. I ended up buying the M5 enhanced upper because I got tired of trying to get the shims right on a standard upper and I actually bent the index pin on the extension and had to send it back to Craddock, which they fixed for free (I paid shipping both ways). I think the only thing I'd change is I'd probably just get a standard A2 buttstock and save some money because I just don't use the features of that Magpul stock like I thought I would.
I'm at about 16.5 pounds with this setup, including glass.
Build specs:
Upper, lower, handguard, bolt carrier—Aero Precision.
Bartlein 400MODBB. 22" w/rifle +3 gas
Wilson combat adjustable block
Bolt—JP enhanced
Trigger—TriggerTech primary or diamond (can't remember off the top of my head)
Magpul PRS buttstock
Magpul MOE+ grip
CMMG ambidextrous safety selector (not installed when I took the photo)
Area 419 Arcalock rail.