Magpul M-LOK Rail Cover Type 2

The M-LOK system uses a rectangular T-Nut and a rectangular slot To Continue tightening the screw to the correct torque specs:

What is M-Lok?M-Lok is a The M-Lok rail system features elongated slots similar to Magpul's MOE slots

m91 slot All hardware necessary for attachment directly to M-LOK Slots on either aluminum or polymer hand guards and forends is included Also work well on M-LOK Chassis

meyd568 Rail specifications​​ The slots on an M-Lok handguard are approximately 32 mm long and 7 mm wide and space 8 mm from each other