Briley has great engineers and artisans. If this is true, I opine that their O/U would be a heavy competition tool rather than a field gun. That's where the money is.
Kolar, who make arguably the world's best competition O/U, has worked closely with Briley in the past. Kolar also made the T-90 trap single for Remington that lots of top trapshooters use, even after it was discontinued.
Kolar's baseline model runs about $7500. Briley makes their choke tubes, I believe.
Whether or not Kolar makes it, a Briley O/U will certainly be at least 8 lbs, last darn near forever under heavy use,have sweet triggers, adjustable thingies to set POI/POA, and lots of choke tubes designed for optimum performance in those bores. I'd wager it'll run over $6K...