I used the HS Precision DBM system in two different BDL stocks.
1) McMillan Game Scout. It needed minor sanding inside the stock to get it to fit. The part circled in the image was catching on the stock before it would get seated all the way.
2) HS precision BDL stock - 100% drop-in fit.
Probably find one on sale within the next 7- 10 days. Tis the season for saving $$$.
From HS Precision: "Our stainless steel conversion kits are designed to convert your Remington 700 BDL hinged floor plate over to a detachable magazine box feeding system. The external dimensions of the floor metal are identical to those of a factory hinged floor plate. Meaning this system will fit any stock with minor to no inletting required."
All the factory Remington DBM systems I've seen have a notch in the stock for the magazine release (except for the 338 Lapua model).