Years ago, I traded a stripped Olympic Arms AR15 lower straight across for a Ruger 10/22 carbine. Back in those days, it was brand new and wore a synthetic stock. I replaced that with a wooden take-off that my gunsmith gave me. Thousands of rounds later, I started to experience some extraction issues: double feeds, stove pipes, etc. At first, it only happened during rapid fire, but then it started with slow fire. Can't get through a single magazine without a failure. Back when the BX-25 magazine came out, I bought it hoping to solve my problem. It didn't. Well, after my last trip out with it, I decided to tear it down and see if I could find the culprit; and I did.
On the picture to the left, you can see the bolt assembly for my Ruger 10/22. Now, I've been known to disassemble a few guns and do some mods here and there, but rarely ever have I had to actually diagnose and make repairs to them. Upon close inspection, the problem jumped out at me, or so I believe it has. The extractor is rolled over and won't even hold a round against the bolt face, much less extract the spent cartridge properly. Being as this component is a $2 part at shopruger.com, and is made of stamped steel, it's not exactly a high tolerance component. I did find out that the MK III pistol and 10/22 rifle share the same extractor. So, if I really wanted to, I could swap them and see if the problem follows the extractor. I could also swap entire bolt carrier assemblies between my 10/22 and my wife's 10/22 CRR, but since a Volquartsen Exact Edge extractor is only $12, I ordered it and will put it in and see how the gun shoots. I can't get any worse than it is now. That much I'll say.
Here's a video of the jam caught. It's at the end. If you look closely, you can see the double feed.