That is a repairable crack!
Before my stroke I welded hundreds of M1 Garand receivers and had no problems. I do re-harden the receivers after the weld. Even after I welded a rear lug on them. TIG weld would work for that.
The only thing you need to avoid is the porosity in the weld so run heavy argon with the weld.
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This year will go down in history. For the first time, a civilized nation has full gun registration. Our streets will be safer, our police more efficient, and the world will follow our lead into the future!" -Adolf Hitler,1935"
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