JMac Customs MLOK Skeleton Forward Grip Hard Coat Anodized Black. Can be used as a forward grip or a handstop The quarter-turn T-slot nuts have different torque specifications depending on the handguard material: 4.0 N?m (35 lb?in) for attaching metal accessories to metal handguards. 1.7 N?m (15 lb?in) for attaching polymer or metal accessories to polymer handguards. Specifications for JMac Customs SFG MLOK Skeleton Forward Grip: Manufacturer: JMac Customs Color: Black Finish: Hard Coat Anodized Gun Type: Rifle Material: 7075-T6 Aluminum Weight: 1.62 oz Mount Type: M-LOK Gun Rail: M-LOK Fabric/Material: 7075-T6 Aluminum Features of JMac Customs SFG MLOK Skeleton Forward Grip Muzzle Device Shim Package Contents: JMac Customs SFG MLOK Skeleton Forward Grip JMac Customs SFG: SFG MLOK Skeleton Forward Grip Hard Coat Anodized Black