I have an older Ruger Standard .2 auto pistol that I bought recently. It's from the early '70s, but looks to be practically unfired. It was really gummed up bad, like someone had used some WD40 on it decades ago, and it turned to varnish. I cleaned it up thoroughly. It shoots and functions fine, except for for an odd malfunction.
About once per magazine it misfires. Click and no bang, but no dent on the rim at all. I started paying attention and every once in a while the bolt doesn't close all the way. It hangs open a tiny fraction of an inch because the rim is partially caught on the extractor but not quite in the bolt face where it should be. It seems to be an extractor problem but I can't quite figure it out.
I took the extractor out and compared it closely to the one from my other Standard that I've had for 30+ years and shot tens of thousands of rounds through, and can't see any difference. I even swapped the bolts between them and they both seemed to work fine then, but I don't want to permanently swap parts between them.
I suppose my next step is to order a new extractor, but I thought I'd check here first and see if anyone had ever seen this problem before.