Henry BB-CSM Cantilever Scope Mount for 1st Gen Big Boy H006

These bases will not fit Henry .30/30 or Henry .45-70 rifles as they are not Big Boy Series(pistol caliber: .44mag,.45Colt,.357mag,.41mag,.327Fed Mag) guns. For .30/30 or .45-70, you can purchase a Weaver 63 baseTo optimize accuracy, Henry Scope Mounts mare made for all Henry H004 series Golden Boy, H006 series Big Boy and H005 Mini Bolt models. Each of their rifles now come drilled and tapped for easy scope mount installation. Henry Repeating Arms H001 series lever action rifles do not require use of these mounts as the receivers are 3/8ths groove. The Golden Boy Scope and 1st generation Big Boy rifles are drilled and tapped under the rear sight. Current production (2nd generation) Big Boys are drilled and tapped on the top of the receiver. To determine which generation of Big Boy you have refer to the serial number table provided so you select the correct mount. Instructions on installation of the scope mounts is provided in the packaging. All Henry Scope Mounts accept Weaver style detachable 1 in. top mount rings (rings not included).Note to Big Boy owners: In September 2011 they began shipping the 2nd generation Big Boy rifles which feature receivers that are drilled and tapped for the scope mount. In previous production 1st generation the barrels were drilled and tapped if rollmarked Bayonne NJ. First generation Big Boys use the BB-CSM Cantilever Scope Mount. 2nd generation current production use the new style BB-RSM Receiver Scope Mount. 2nd generation Big Boys start with the following serial numbers: H006 = BB0047222 H006M = BB0015530M H006C = BB0021188CBig Boy scope mounts will not fit H009 series .30-30 rifles or H010 series .45-70 rifles. These rifles are drilled and tapped for a Weaver 63B.