Does anyone know of quick detachable scope rings to fit the old style Unertl/Lyman/Fecker dovetail target scope block dimensions? I have Lehman Featherweight rings on a Winchester 63, one scope block in the barrel dovetail and the other just in front of the receiver. These mounts are light, low and streamlined but they are fixed, i.e., locked on by Allen screws. The Hill rings, also from the 1950s, do detach easily but are held by rather weak thumbscrews and I suspect they will work loose on a semiauto.