CZ455 Weakening Extraction

[brusky]

For the past few weeks I noticed the case extraction has gotten weaker. Well today it wouldn't even flip the cases out of the action causing me all sorts of problems.

What's causing this? I assume a part has worn down over time and needs to be replaced but I'm not sure which part it could be. I break down my bolt regularly for cleaning so that eliminates any issues with gunk buildup. Thoughts?

 

[AirCapitalOutdoors]

Retaining ring around extractor rods getting weak?

 

[Near miss]

Take the bolt out.
Slide a round under the extractor.
-Will it stay put there, under the pressure of the extractor?
-If not, it may be the spring.

-Can you remove the round by pulling it outwards or by bending it, using moderate force?
-If you can, it may be the extractor itself. Check that it has decent edge / no lost material from it.

Can not really give more advice than that.

 

[brusky]

That's perfect.

What actually kicks the brass out of the electors when the bolt is pulled rearward?

 

[barronian]

are the extractor arms inserted on their correct sides ? (they are not symetrical)

there is a small protrusion from the aluminum 'chassis' that sits under the bolt and around teh magazine well - this is what 'kicks the brass out'.

 

[SanginSpecial]

In addition to a weakening spring... When's the last time you cleaned the carbon out of your chamber and verified it with a borescope?

I've had a carbon buildup cause extraction problems.

I've also had a corner of the extractor break off which didn't leave enough "claw" to maintain grip on the spent casing. CZ extractors are notorious for having missing corners on the extractors.

 

[Lesloan]

For the past few weeks I noticed the case extraction has gotten weaker. Well today it wouldn't even flip the cases out of the action causing me all sorts of problems.

What's causing this? I assume a part has worn down over time and needs to be replaced but I'm not sure which part it could be. I break down my bolt regularly for cleaning so that eliminates any issues with gunk buildup. Thoughts?

Is the problem that the extractors don't withdraw the spent case from the chamber, or that they don't get ejected from the action? If the latter, my guess is that the extractors are doing their job but the ejector isn't. And vice-versa,