Ok it is the Cantilever system and you need a gunsmith to install it as it looks like it bolts to the barrel and the Henry site says ** Requires Gunsmith Installation. This would be one project I would not tackle I would let a smith do it. Should not cost that much to do most smiths charge anywhere from a low of 8 bucks a hole which is dirt cheap to a high of 20 bucks a hole and considering where they are drilling and the jig and equip to do it right I still consider that cheap. So for a high of around say 65 bucks including the mount you should be able to mount your scope. That is not bad considering it cost me 75 bucks to get a peep sight installed on a Mauser with the peep sight that cost 35 bucks. And I did not complain about that one bit. :grin: Jim