While a good cleaning of a torn-down bolt might reveal all sorts of junk in there, preventing proper safety operation - the safety end, and/or firing pin retainer/cocking piece at the rear part of the striker, may be worn - needing the parts replaced.
The striker parts all interlock, and readily disassemble from each other, once the mainspring/pressure is removed.
IIRC, the safety parts are held by a retainer pin.
My M70XTR's not available, right now, for me to look at in detail for you - but when I open my safe tomorrow, I'll double check it (I haven't had to take one apart for over ten years) and repost if anything I see is different from my recollection above.
[EDIT: My safety appears to be held in by the striker/firing pin parts, and should be able to be removed from the bolt shroud after the FP, etc, are disassembled. Take care that the safety detent & spring don't take a side trip, when the shaft is withdrawn.]
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