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Have had good luck with the Korean UU stamped ones. They were cheap, well built and functioned. Certainly not collectors, and they are painted (not blued). As referenced, not much luck with the older GI splitbacks, and precious little luck with most knock off 30's.
If changing the recoil springs and re-oiling doesn't do it for function, might try cleaning the gas system. If you shoot enough, eventually you will need to.
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