Monstrum Picatinny Rail Mount Compatible with Henry Big Boy H6 and H12 Lever Action Rifles 11 Slot. Compatible with Henry Big Boy H6 (H006) and H12 (H012). Not Compatible with Henry H1 Frontier (H001) Henry H9 (H009) Henry Big Boy X model 45-70 (H010) Henry Golden Boy or other Henry rifle models. Scope mount installs directly to receiver via the factory mounting holes and included set screws with no additional hardware required. Allows for the mounting of Picatinny or Weaver standard scope rings scope mounts red dots or other optics. All Monstrum optics mounting products come with a lifetime guarantee. Specifications for Monstrum 11 Slot Picatinny Rail Mount Compatible with Henry Big Boy H6 and H12 Lever Action Rifles: Manufacturer: Monstrum Color: Black Finish: Anodized Fabric/Material: 6061 Aircraft Grade Aluminum Quantity: 1 Base/Mount Type: Top Rail Mount Gun Make: Henry Gun Model: Henry Big Boy Gun Type: Rifle Length: 11.4 cm Width: 1.3 in Height: 0.5 in Weight: 1.2 oz Package Contents: Monstrum 11 Slot Picatinny Rail Mount Compatible with Henry Big Boy H6 and H12 Lever Action Rifles Monstrum RM215-11: Picatinny Rail Mount Compatible with Henry Big Boy H6 and H12 Lever Action Rifles 11 Slot