I got a B.C.D. from Parker Mountain Machine. Works great.
I have a Magpul B.A.D. on my S&W M&P15T and wanted a consistent BAD for my SCAR 17S; the PMM B.C.D. is that device.
By the way, when installing the torx bolts (screws) on the PMM BCD pad, don't over torque; I did on one of the screws and it snapped at the head.
However, emailed Jarod Legsdin at PMM and he mailed me new torx bolts at no extra charge. Great Customer Service!!