Watchtower Firearms Handstop - M-LOK Hardware 1.5 slots Black Anodized. This M-LOK attachment allows an operator to enhance their rapid weapon deployment and can be used as a barricade stop. Specifications for Watchtower Firearms Handstop - M-LOK Hardware: Manufacturer: Watchtower Firearms Fabric/Material: High-Grade Billet Aluminum Mount Type: M-LOK Features of Watchtower Firearms Handstop - M-LOK Hardware High-grade billet aluminum; Integrated barrier stop; 2 QD sling points; Extremely lightweight at .70 oz; Black FDE or OD Green anodized finishes; M-LOK direct attach (requires minimum 1.5 M-LOK slot); Package Contents: Watchtower Firearms Handstop - M-LOK Hardware 2 T-nuts 2 x bolts Watchtower Firearms GRP-HS-BLK: Handstop - M-LOK Hardware 1.5 slots Black Anodized