Sharps Bros Ultra Lite MLOK Handguard Active Retention 610737242729 K8014 5XL ELB K8014 5XL 5XL N 1361673432XL 610737242729 K8014 5XL ELB K8014 5XL 5XL N PE 880653223434 K8014 2XL ELB K8014 2XL 2XL N PE 610737242712 K8014 4XL ELB K8014 4XL 4XL N PE 610737242750 K8014 S ELB K8014 S Small N PE 880653223441 K8014 3XL ELB K8014 3XL 3XL N PE 610737242736 K8014 L ELB K8014 L Large N PE 610737242767 K8014 XL ELB K8014 XL XL N PE 008806532234340 K8014 XS ELB K8014 XS XS N PE 610737242743 K8014 M ELB K8014 M Medium N PE Use the included key that matches your rail and confirm your exact model with the Streamlight fit guide before you mount it Sharps Bros Ultra Lite MLOK Handguard 6061 T6 aluminum Barrel nut torque range 35 40 ft lbs Screws range from 30 35 inch lbs