I've picked up one of the IMA untouched Mk IV rifles. The action wouldn't move but I managed to get it all apart.

The breech block is apart with the striker spring out but the striker is quite solidly stuck inside the breech block in the forward position with the pin protruding. I've been soaking it in PB blaster for about 24 hours but no luck getting it free yet.

Its a bit awkward of a piece to try and get out. I have a set of brass punches and a brass hammer. I can get a brass punch into the tumbler slot and tap but I haven't gone nuts. Is it safe to tap the protruding firing pin with a soft hammer?

What about heat? Are any of these parts heat treated? Is there risk to heating them up?

If anyone has some advice, I would appreciate it greatly.
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