BCRider
Member
A buddy and I have been working on tuning his JM 625. We've got it firing rounds consistently but only with a higher trigger pull than we think it should have. We're currently using the stock mainspring ground SLIGHTLY narrower (not thinner) and this is working with the 14lb rebound spring from a Wolff kit.
He's got an extended firing pin and we're wondering if it would help with allowing the tension on the mainspring to be set to a little lower value which would also then allow the use of the 13lb rebound spring.
Note- the mainspring tension screw on this gun is a longish set screw with the frame drilled and tapped for a locking setscrew. So mainspring tension is intended to be adjustable. Not sure if this is a stock setup for the JB625 or if it was done by the previous owner. It's NICELY done though.
The pin that is in place does in fact extend out to what seems like a decent amount. Haven't measured it to be fair but the Mk I eyeball suggests that it should be OK. But it does require pushing on the pin's anvil fairly far into the frame.
Thoughts? Experience with extended pins? Folklore on why one would want an extended pin?
He's got an extended firing pin and we're wondering if it would help with allowing the tension on the mainspring to be set to a little lower value which would also then allow the use of the 13lb rebound spring.
Note- the mainspring tension screw on this gun is a longish set screw with the frame drilled and tapped for a locking setscrew. So mainspring tension is intended to be adjustable. Not sure if this is a stock setup for the JB625 or if it was done by the previous owner. It's NICELY done though.
The pin that is in place does in fact extend out to what seems like a decent amount. Haven't measured it to be fair but the Mk I eyeball suggests that it should be OK. But it does require pushing on the pin's anvil fairly far into the frame.
Thoughts? Experience with extended pins? Folklore on why one would want an extended pin?