I would guess the screw is broken not stripped. Its a not-uncommon failure, although not normal at 1000 rounds. BCM certainly should help you.
Andy
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If is your only AR then I would buy a spare BCG so that way you can change over to your spare BCG and worry about it later.
Brownells M16 nitride BCG is on sale for $100. A good spare for the price.
There is also the Expo Arms mil-spec carrier for the same price. Primary Arms house brand I believe. Probably not crap.
Both have a lifetime warranty.
ToolCraft shows in stock:
https://www.armorally.com/shop/toolc...carrier_group/
I guess whoever built this one didn’t get the seabag speech.
I'd look at Black River Tactical:
https://blackrivertactical.com/WP/BC...Parts-c1852003
Also available at Forward Controls Design's website:
https://www.forwardcontrolsdesign.co...phosphate.html
Clint and Duffy (owners of BRT and FCD, respectively) are solid guys and contributors on this forum.
Reverse torque check is not an acceptable inspection for final assembly (unless specifically called for by the tech data). Any fastener subjected to a reverse torque check should be loosened, the threads cleaned, inspected and re-torqued according to spec. A reverse torque can loosen the fastener without any perceptible movement leaving the fastener, not only under torqued, but loosened. Also, most torque wrenches are not certified for torque in a counter clockwise direction.
If there is the least suspicion a gas key is leaking, remove it. I've had a gas key fasteners that passed the torque check, where the fasteners were torqued in a clockwise direction with no signs of movement. Yet when the key removed, there were signs of leakage between it and the carrier. Cleaning and reinstalling the gas key solved the malfunction the AR was having.