This is simple blowback? Even with the balance valve there may not be enough energy to recharge the action. A bypass from the transfer port to the hammer could add some energy if need. Very cool and super clean work!Tom
A bypass from the transfer port to the hammer could add some energy if need.
I tried a probe only blowback in a .177 12 fpe BSA and there was no way it would have compressed the hammer spring.
If you look at Caselman drawings the bolt retracts some 25mm before venting out while in my tests it was only about 10mm.
Good job, you really do work fast
Autos/Semi-Autos have zero interest for me
Does the pressure act on the probe only or did you drill a hole to let pressure push back the hammer also?