Billet aluminum M-LOK hand stop that doubles as a barricade stop and a support-hand index point.

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Next Level Armament NLX-HS AR-15 M-Lok Handstop Anodized Black
The NLX-HS is Next Level Armament's M-LOK hand stop, cut from billet aluminum and hard coat anodized. It gives the support hand a fixed reference so grip position stays consistent from string to string, which is what lets a shooter drive the rifle with the support arm.
Next Level also pitches it as a barricade stop that keeps fingers off a wall or post, and as a plain index point. It mounts to any M-LOK slot.
Add the Next Level Armament NLX-HS M-LOK Handstop to your build and see how it enhances your platform.