Gunner wrote in
:

Nope..flat based

Flat on top only or flat on top and both sides?

Many airguns, today, are flat on top with a dovetail groove on each side to
take an airgun-style clamp-on scope/aimpoint/laser sight. (The dovetail
runs the length of the receiver instead of perpendicular to the receiver.)

A short stop at a Wal-Mart will give you an idea of how these things attach
since they carry both airguns and airgun scopes/mounts.