Those parts are both surface hardened to prevent wear over time. If you cut/grind on them you'll go through that hardened surface and it will wear fairly quickly with use unless they are re-hardened after the modification. Personally, you'd be smarter to just get used to the longer pull (part of owning any firearm is getting accustomed to it's unique traits and quirks) rather than modifying it and potentially ruining the value. Also note that finding parts for these old 99's is extremely difficult so if you screw up you could ultimately make it totally useless and little more than a parts gun.
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