Not all weld-ups are junk. And, after all, the primary force is on the bolt lugs, which are in front of the weld. In comparison, the forces acting on the rear of the receiver are quite small.
I bought one from a buddy. He'd glass bedded it and had some match parts, including sights. Easily 1.5 MOA.
The weld itself was very well done. Not detectable, this side of magnafluxing.
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