OK, My memory is KAPUT, but there are TWO different versions of the Baikal Hammer Double.
Version one. You just cock the gun with the external hammers. When you hit the opening lever is will just "fall" open. The actual
hammers that hit the firing pins are internal and are powered by coil springs.
Version two: The external hammers actually strike the firing pins and cause ignition. I also don't think that gun is a true sidelock.
If memory serves (probably not) there is a linkage from the hammer to coil springs. Same same the first version, if you hit
the opening lever, the gun just falls open.
You have taken external firing pins out. That means you have the second version with true external hammers. The gun doesn't need to be taken any further down. Contact EAA Corp in Florida. Prime importer for Baikal and probably the US Parts distributor too. Tell em what you have and what you need. Should fix you right up.
If you run into trouble, the "go-to" guy for Baikal is "Nate Kiowa Jones" in Texas. If he doesn't know it, nobody does. If you can't get OEM parts, find a good machinist or Gunsmith and have a new firing pin made. Those aren't Rocket Science. Use to make em alla time afore I retired.
The Russian made Bikal guns are very well made. Very tough little guns (they are kinda light). Well worth fixing.
Coffinmaker
ps: stevesgunz.com