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. GreatCustomerService!!