Yes
I have an original one from Gene Davis
It works great on a weaver T36
The new company does not make all the sizes, I tried to get anew one last year for a Leupold 45, but that do not make for that model
Bill,
I have both a slip on and a screw in and like them both for their increase in power. They come in
several power ranges. If you look on this site and accurate shooter they come up for sale from
time to time.
Regards,