MDT Exterior M-LOK Forend Weights allows you to finely tune the balance of your rifle. These weights add an additional 0.78 lbs to your rifle setup, and are compatible with any stock/chassis that is M-LOK compatible such as MDT’s ACC, ESS, LSS-XL, and TAC21 (M-LOK forend) chassis systems. Adding these weights can seriously cut down on recoil, allowing you to self-spot your shots, and install using standard M-LOK T-Nut hardware. Includes integral QD flush cups to attach slings and other accessories. MDT M LOK Exterior Forend Weights Blk 2pk 107320-BLK