JMac Customs HRD MLOK Handstop Hard Coat Anodized Black. Compact lightweight & reversible. 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 HRD MLOK Handstop: Manufacturer: JMac Customs Color: Black Fabric/Material: 7075-T6 Aluminum Condition: New Mount Type: M-LOK Gun Rail: M-LOK Weight: 0.36 oz Finish: Hard Coat Anodized Features of JMac Customs HRD MLOK Handstop Flash and Sound Enhancing Muzzle Brake Package Contents: JMac Customs HRD MLOK Handstop JMac Customs HRD-1: HRD MLOK Handstop Hard Coat Anodized Black