I recently bought a pair of Echo1 AKs from Revolution (the AKM and the CPW), and have had no problems. I had them opened up to drop in a 110 spring, had them regressed and reshimmed, which I do with all new "Canadian" guns that shoot over 400.
Echo1 guns are not built to withstand springs that high. And while I don't think it would happen that fast, such a high tension spring could certainly destroy internals.
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