This is a Impact Weapons Components Hand Stop, model WWMLOKS.
Impact Weapons Components designed the reversible Smooth face of the M-LOK Hand Stop to provide a comfortable" ergonomic and low profile leverage point for your hand to push or pull against or for placement between your fingers as you grip the firearm. It's in its element when placed at the front of a Pistol" as the Smooth face is ideal to press your hand against for increased leverage" stability and control. Their exclusive Captured Fastener Design" which retains the fastener in the mount" and reduces the size of the access hole needed for the fastener to one just big enough for the hex key to pass into" reducing the likelihood of the Hand Stop becoming clogged with dirt and debris. The ultra-lightweight design weighs only .507 ounces and it directly attaches to any Magpul M-LOK(R) compliant slot.
Features:
The Hand Stop directly attaches to any Magpul M-LOK compliant slot
Ultra-lightweight design-only .507 ounces
Exclusive Captured Fastener Design