a bench grinder, a file, and wet 600 grit sandpaper will all have their own effect on the surface of the Norc frame. a bench grinder had no problems taking the new Norc Commander's square trigger guard and making it round.
i think my Merlin II engine block is made of stronger stuff than that...
I would be concerned if files and grinders didn't cut the steel well...that would mean it had been hardened into the 60 range of the rockwell scale.
That would sure make for a nice grenade in your hand...
Your engine block is made of cast iron, so again not surprising if the machining characteristics are fairly different. Cast iron is typically harder but also much more brittle. If you took a chunk of it the size of a pistol frame and hit it with a hammer you'd shatter it.




















































