Sub 12fpe impact have a different barrel port, hammer and hammer spring, yet the distance the hammer travels from trigger sear release to valve strike is the same as it is for high power monsters. IMO opinion this makes the firing cycle slow and induces rattle and twangs as the weaker hammer spring settles after are each shot. I also don’t like the amount of metal to metal contact in the hammer channel, the vibrations (and noise) drives me nuts, it can’t aid accuracy either, so I came up with this.
new ptfe hammer guide, ptfe top hat to support the spring and stop the metal hammer becoming in contact with the valve stem. In addition there is a delrin insert into the nose of the hammer to reduce travel distance from 22.5mm down to 16mm, the c3 bumper is still in use.
I needed to add more hammer preload to make up for the shorter distance to attain enough speed to open the valve but the gun feels so much nicer and consistency is better, not yet been able to test for accuracy but I would guess it’s not made it worse.
Bb
new ptfe hammer guide, ptfe top hat to support the spring and stop the metal hammer becoming in contact with the valve stem. In addition there is a delrin insert into the nose of the hammer to reduce travel distance from 22.5mm down to 16mm, the c3 bumper is still in use.
I needed to add more hammer preload to make up for the shorter distance to attain enough speed to open the valve but the gun feels so much nicer and consistency is better, not yet been able to test for accuracy but I would guess it’s not made it worse.
Bb