Hard to say right now, whatever people are willing to pay. People are paying more than usual for everything. I'd imagine between $500 + for 6920 lower.

Doug, thanks for the clarification Sir. Colt lowers are not any better quality but the Brand Name usually commands a higher price in the market. Cheers and stay safe!

Nice I'd also look at Aero Precision, those are out of stock everywhere right now, but next time they're in stock I'm gonna probably grab 2, 1 for a 300 BO pistol build and the other just to have for future projects. A busy of mine built Aero Precision/Bcm Rifle with a Aero lower for the base and it is a pretty sweet rifle, I've got most of my build planned just not sure about my trigger, either be an Rise Armament RA535 ,or a Geissele Flat Bow Single-Stage Precision (SSP), I hate spending that much on a trigger but the reviews I've seen of these 2 make it seem worth it.
Good luck on your build.
👍🇺🇲