Visually and physically confirm the chamber is empty before doing anything else.
Insert the mounting screw through the top of the accessory. Apply thread locker to tip of threads (unless pre-treated). Thread the T-nut onto the screw from the back. Make sure the ridged locking tabs (the "stem") of the T-nut are facing toward the accessory.
Note: The initial threading might feel tight due to pre-applied thread locker. You can use pliers or a small wrench to hold the T-nut still while you clear the initial friction.
Thread the T-nut down, then loosen it slightly. The gap between the bottom of the accessory and the flat side of the T-nut must be slightly wider than the thickness of your handguard rail. If it is too tight, the nut won't pass through the slot; if it is too loose, the nut will spin freely without catching.
Turn the T-nuts so they align straight (parallel) with the accessory's recoil lugs. Drop the accessory flush into your chosen M-LOK slots. The accessory's built-in recoil lugs should seat entirely inside the slots to prevent forward or backward sliding.
Insert a 1/8" hex wrench into the screw, apply mild downward pressure, and turn clockwise. As you turn, the T-nut will automatically rotate 90 degrees to cross the slot perpendicular to the rail, hitting a hard stop. Continue turning until the screw is hand-tight. If possible, glance through the handguard or side slots to visually verify that the T-nut has fully turned 90 degrees.
Secure the accessory firmly. Follow the torque spec for your weight type:
