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I'm not so sure it was a repair. It does look like the gas block is a welded-on assembly, at least for this commecial IJ, not machined as in a military barrel.Looks like a weld-fix that just split again... and not surprising that it did!
Understood & I agree on the poor quality weld. It could very well be a repair. I thought it might be original work from the evident fit-up between the block and the barrel. Substituting welding for machining is a typical commercial cost saving re-design. Don't really know if IJ did this on their commercial carbines.Well I said it looked like a repair because of the bubbled and eneven appearance of the weld... if thats original it was VERY shoddy work to begin with!