I believe PT&G makes one for a BDL inlet but the magazine used isn't the standard AI pattern. I believe it is a similar style and accurate mag brand, but some of the dimensions are different to suite the different style DBM.
The Stiller bottom metal supposedly fits a BDL inlet. The few stocks I've put them in needed minor inletting in the mag well area higher in the stock, but these were stocks with aluminum bedding blocks and not factory stocks.
I have a bad reputation of getting shit right then sending it down the road. Figured it would be nice to be able to remove the DBM and put the factory metal back on if/when that happens.