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You have to drill and tap the barrel Also, I have one :/ with the tap and drill it comes with.
I was going to use it on a rimfire rifle sorta a .22rf scout rifle?
The glass is very good in mine, but it is only a 3/4" tube!
XS Sites makes a simiar setup. Their's requires tapping a hole on the front of the receiver. It also locks in the rear sight dovetail with a set screw. I mounted a Burris Fast Fire III on my son's rifle with one of these. Incredibly fast to use. It may offend the iron sight purist though.
I wish Beeman still made the SS-1 2.5X scopes. With a modified air rifle base mounted on the bolt of the pre-angle eject 94's, this be the ideal setup fer me.