Instead of a metal pin to drive out the rear axle pin, consider using a bamboo chop stick. These have reasonable linear strength, and are not likely to damage anything. If it takes more force than this, there is something else holding it in.
If you have made sure it isn't loaded:
With the muzzle pointed in a safe direction, see if you can relieve the firing pin spring tension by pushing in on the front of the sear.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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