Perhaps no help at all but i have had a 20 repro since 85 and used it quite a bit. It is still very tight, too tight some might say. I was assembling it while talking with some fellow shooters and always have used synthetic grease on wear points. When i went to attach fore end it would not close always having been tight. A little extra grease was all it took to stop it from latching. Grease, dirt, debris, a ding in metal on either side can drastically change already very tight tolerances.
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