These Magpul MOE M-LOK Hand Guards are built for mid-length AR-15/M16 firearms. The MOE M-LOK Hand Guards are built with the same strong yet light weight polymer as the legacy MOE Hand Guards, but comes with the M-LOK slots at the two, six, and ten o’clock positions. The M-LOK system allows for the attachment of optional M-LOK rail sections and other M-LOK accessories such as light mounts, slings, foregrips, etc.
AR-15, Issue:11, Page:050
Big Book Catalog, Issue:71, Page:055