There is an adjustable stop pin

that lines up with one of the holes on the top of your receiver. There are 6 clamp bolts to really grip your 11mm dovetail grooves. Any Weaver or picatinny style scope rings will lock into the cross-wise grooves on the top of the adapter for a super secure mount system capable of withstanding any magnum style spring air rifle.

I designed and manufacture these from 6061 T6 aluminum alloy and they are now hard anodized in black. I charge $40.00 which includes shipping and instructions.

Tom