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steel 1911? find a norinco. the Chinese built them with reclaimed rail road track. mine weights about 14 lbs.
Virtually 100% sure they're NOT 'mild steel' but carbon steel. Why would you want one made from an inferior steel anyway?
I'm sorry, you are 100% correct - I meant "carbon steel". Editing OP now...
STI or Caspian from Brownells.
Sku# 108285
View attachment 199183
Railroad tracks are also carbon steel... Not as high a carbon as other alloys, but far better than mild steel.
Sku# 108285
View attachment 199183
I have one and love it. I think they stopped making them when the E series line was introduced. Good luck on your quest!