This is why buying used parts is a crap-shoot.
I don't buy used anymore, 1/2 the time you're just buying someone else's problems.
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This is why buying used parts is a crap-shoot.
I don't buy used anymore, 1/2 the time you're just buying someone else's problems.
This. Johnny Gunsmith went to town with his dremel to make it an "Operator's Carbean" with M4 food ramps and all. When he FUBAR'd it...he sold it to the next guy down the line. Your friend was the next guy.
If you need to cut, grind, weld, or adjust fit, do it on the cheapest part to replace. As the upper appears to be the issue when tried on multiple lowers, I'd focus my efforts there. Make it fit the lowers, not the other way around.
Quality Cerro forge forging, shitty machining, what a waste of material.