I've been following the sagas of people having problems with the AR Stoner BCGs. Look at the ejector from this bolt. You could barely move it with a cartridge hooked in the extractor, and it didn't have full travel.
I swung by Rhine Group, and they swapped the crap ejector out for me. Now it moves freely. Yes, I would rather buy a BCM BCG in a heartbeat. Never in stock when I am looking.
Since they did it for the parts cost, I'll point out they have some rifles in stock. Eagle Arms (sorry, I know they are on the boycott shit list) with non chrome lined barrels. 16" middy. Just under 1k. My opinion, better than a DPMS Sportacle.