All Collections
Product Guides
Classic M-Lok Adapter - Product Guide
Classic M-Lok Adapter - Product Guide
Max Gearing avatar
Written by Max Gearing
Updated over a week ago

The Classic M-Lok Adapter enables our range of Spartan Javelin Bipods, Ascent and Sentinel Tripods, and Davros Heads to be attached and detached in seconds to rifles with genuine M-Lok accessory rails.

1. In the kit

  • Classic M-Lok Adapter (Features T-Nut fittings and retainment screws).

2. Installation

The M-LOK direct attachment system is extremely intuitive and easy to use. Because of the

versatility of the system in accommodating various thicknesses of mounting surfaces and the adjustments that allow this functionality, the tips below will help the user to have the best possible results in the fastest possible time.

Setting the NUT to the correct height

For best function, the T-Nut “gap” must be slightly greater than the thickness of the mounting surface. This can be done by measuring the mounting surface thickness directly or using the edge of the mounting surface as a gauge. For most aluminium mounting surfaces setting the nuts with the highest edge of the T-Nut even with the bottom edge of the recoil lug, will provide correct function. Some thicker rails or polymer rails may require the nuts to be looser with a one or two thread gap between the nuts and recoil lugs.

Check that the accessory is fully seated into a slot when mounting

The bottom of the accessory should sit flush with the mounting surface. If it doesn’t then slide the accessory fore-aft until it drops fully into the slot with the lugs engaged.

Turn the attachment screws

Apply some downward force on the hex wrench to make sure that the screw is seated, and then tighten. For maximum repeatability, “bias” the accessory before fully tightening.

To bias the accessory, apply just enough lateral pressure to the accessory to make solid contact with one side and the front (towards muzzle) of the slot, similar to when installing a Picatinny rail accessory. Then tighten all fasteners fully. This step is not necessary, but aids repeatability.

Ensure that the T-Nut rotates the full 90 degrees into the locked position

If you have adjusted the nuts appropriately, they should rotate into perfect 90 degree alignment with a ¼ turn of the screw.

If the T-Nuts are not rotating properly

  • When nuts are spaced too far then the nut will rotate freely without stopping and tightening.

  • In this case the nut will have to be screwed in closer to the bottom of the accessory. Simply remove the accessory from the slot and screw the nut on one full turn. Repeat as necessary so that the cam engages the slot when the screw is tightened.

  • If the nut is spaced too close to the accessory, then the “wings” of the nut will contact the sides of the slot and the nut will not rotate into place. This will cause the nut to tighten against the accessory lugs without engaging the hand guard.

  • In this case the nut should be unscrewed until it is spaced far enough away from the lugs to allow it to rotate properly into position. Unscrew the nut one turn at a time and retest function.

It is best to observe the T-Nut rotating, if possible, to be certain that it turns fully in to place, or to check it after tightening is complete

  • Most hand guards or other mounting surfaces have holes or vents that can be seen through to confirm that the M-LOK T-Nuts are properly engaged with the slot, 90 degrees from slot orientation.

  • If it is not possible to watch the nut rotate, then careful attention needs to be paid to the screw as it is tightened. The screw should turn easily for the first quarter turn, then when the nut stops rotating it will become slightly more difficult to turn. Continue tightening until secure. Pull on both ends of the accessory to ensure it is engaged.


  • To remove, simply loosen the accessory mounting screws one full turn and the T-Nuts should loosen and align with the slot to be easily removed.

  • If the T-Nuts snag when passing through the slot, simply pull up gently on the accessory and continue to loosen the screw another ¼ to ½ turn, which should align the T-Nuts with the slot.

  • On some polymer mounting surfaces, the T-Nuts may embed slightly into the polymer surface when tightened.

  • When removing from polymer surfaces, easiest function is obtained by loosening ½ turn or so and then pressing down on the head of the screw with the hex wrench. This will free the T-Nut if it has been over tightened, and you may remove normally after this step.

  • If you go too far in loosening before removing the accessory, the T-Nuts may have loosened past the slot to the point that they will not engage and are spinning freely. In this case, gently pull up on the accessory until the T-Nut cams engage the slot, and then they will turn to align with the slot as the screw is loosened further.

Did this answer your question?