Defective Extractor

[LittleCrane]

I encountered a problem this weekend I'd never had before, with an IP carbine I recently got from CMP. Every few rounds the bolt would not close completely. Tried a different recoil spring, same problem. Swapped the bolt with a spare I carry in the range bag and the problem was resolved. Turned out that the extractor was defective, not properly machined apparently. A significant part of the extractor face was flat and the beveled portion was rough. Photos below show the defective extractor compared to a normal one. Both are SG, late pattern. Anyone else had this kind of problem? Is it common? I've had worn extractors but never encountered one that was defective in the first place.

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.

[Bubba-7]

A new one on me, good pictures. Looks like some metal is missing so the slope is flat. I don't know if that is all the problem though. But with another bolt solving the problem, it must have been the problem. Thanks

[Harlan (Deceased)]

Outstanding photos LittleCrane.

Like Bubba-7 says, it's hard to know if that's the real problem because of various factors that might be the bolt itself, but you might be onto something unique.

[LittleCrane]

I validated that it was the problem as follows. Using dummy cartridges, released the slide from a half retracted position. Bolt did not close. Did this several times with different dummy cartridges. Replaced extractor, leaving all other parts the same. Bolt closed without a problem on all dummy cartridges. Repeated the same test again with the bad extractor and a good extractor. Same result.

[Harlan (Deceased)]

I understand what you're saying now LittleCrane and good complete troubleshooting.

I also wonder what the story is on that extractor.

[LittleCrane]

Actually, I missed your point. I think you were saying that validating that the bad extractor does not work in the S'G' bolt while a good extractor does work in the S'G' bolt still does not answer the question -- I need to show that the same result occurs when the same extractors are tested in another bolt. I'll do that tonight. Will also take a better picture to show what the problem with the extractor is.

[karbine kat]

Hi, Haven't Seen Anyone Mention The Strength Of The Extractor Spring, A Spring Too Strong Or Too Long Can Cause The Extractor To Not Close Over The Lip Of The Case, Worth Looking Into!

[LittleCrane]

I ruled out the spring when swapping out the bad extractor for a good one with all other parts (extractor spring excluded) being the same. The photo below should show the problem better than the one I posted earlier. The face of a normal extractor is beveled so that the cartridge base cams the extractor out of the way. The defective extractor is flat over a large part of its face and just slams against the base of the cartridge.