Description The MOE (Magpul Original Equipment) M-LOK Hand Guard, Carbine-Length â AR15/M4 is for firearms with carbine-length gas systems. It combines the light weight of a standard hand guard with modular flexibility of our M-LOK system.Designed with versatility in mind, M-LOK slots at the two, six, and ten o'clock positions allow the attachment of optional 1913 Picatinny rail sections and other M-LOK accessories for the direct mounting of tactical lights, slings, grips, etc.Its reinforced, heat-resistant polymer construction provides operational durability without the weight and expense of an aluminum rail hand guard. Front extensions and the lower lip provide additional operator protection from a hot front sight assembly.