I have seen them before years ago.
But is there anywhere where I can buy an adapter , to use a 12 gr CO2 cylinder in a old Plainfield 137 BB pistol that was designed to use a 8gr CO2 cartridge.
If I can't find one.
I may have someone with a lathe make me one.
Basically from what I remember.
It is just a Tube , threaded on the outside to fit the pistol.
And then threaded on the inside of the other end for the Cap that holds the longer cylinder in the pistol.
8 gr cylinders are hard to find.
But if I use the 12 gr , they are available all over the place.
This is for a pistol that my step daughter has that her late dad left her.