My guess would be the link. Much like Martini's having their levers modified for rim or center fire. Just a guess...



JMH

CW, I’ve done two or three low walls using C Sharps breach blocks.  I believe the 22 RF blocks are unique to that caliber.  You can raise the firing pin strike by a using a longer connecting link but that has a couple potential drawbacks. You might end up with the breach block high enough to protrude above the of the receiver.  At the same time you could find the legs of breach block short of being flush with the bottom of the receiver.

Extra credit: Firing pin diameter 0.078”.

bpcrnut wrote on Mar 4^th, 2024 at 6:43pm:


Thanks!!! I think you could be on to something! I could not see how it was done, so your explanation fits the facts. I guess a little more sleuthing is needed. 
If that is the case, I want one of their BB's. That could be useful!!!

Don. I didn't say anything about not believing you.  There is no reason for you to be defensive. 

This rifle, as it comes from C Sharps is not that way.  Center fire pins, both DZ and C Sharps, go right in and work. I am just trying to learn how this rifle is set up. 

Michael,

I'm a little late to the party but the C-Sharps I have in my possession is a CF and I've been in one that was a RF and from what I remember in the cobwebs - it had a breech block just like the original, the firing pin hole was offset by .070"  Here's an original 22 compared to the C-Sharps and the original has a fp diameter of .110" - fwiw- I don't recall the rf CS having that size pin.
As mentioned, using the same block but changing the link, it's possible, but it's going to change a lot of operating geometry.  Maybe on an 1885 but not an option on the Ballard.  I remember reading something about Pope, or Niedner, or the Zettlers doing this to a HW but having some issues also.  Peterson did the offset bore and that works, just looks hinky.

A couple things to note, the firing pin in my sample CS, it looks like a pin is glued in the way we've been repairing them, (this block came to me via CS) and the size is .079" so did they make it like this?  The other thing about the CS hammer pin is it is a threaded pin vs the split spring pin so don't try driving it out like you do the originals.
See you this weekend if everything aligns.
Greg