B&T Industries - M-LOK Rail - BT-BT73 :

The BT73 M-LOK Rail is designed for use with all M-LOK compatible hand guards, forends and buttstocks. It has 3 usable slots for attaching any 1913 Picatinny rail mounted Atlas Bipods, Accu-Shot Monopods or Folding Foregrip. It requires standard M-LOK sized slots for mounting.

Machined from 6061-T6 aluminum and Type III hard coat anodized. It comes with two 10-24 x 3/8 fasteners and two M-LOK nuts. Available in black only.