I have a Mossberg 930 and my issue is that sometimes I fired it, the bolt goes back to reload automatically ,comes back foward ready to fired up again and click, no shell in the chamber. This does happen every 2-3 rounds. any ideas to help me fix that problem ?

Is it possible that your ejector does not have enough tension or material to grab the spent casing to pull out? The casing expands in the chamber after it is fired and will be difficult for the ejector to dispense the empty casing if it is not able to get under rim. Try this out first and see where it leads you. Cheers and good shooting!

I think you are asking for an EXPLANATION of why, when you put a bullet in a CHAMBER with your fingers the bolt won't close but when you put the bullet in the magazine, it goes in the chamber and the bolt locks DOWN fine. Is THAT a safety system?

ANSWER: No, it is not a safety system. I am assuming that you are speaking of a standard BOLT ACTION rifle in a centerfire caliber configuration. The extractor, located near the bolt face is why it won't close. When you put the bullet into the chamber and then try to shut the bolt, the extractor has to jump over the rim of the shell casing. When you place the bullet in the magazine and then shut the bolt, the bolt face pushes the bullet up out of the magazine allowing the rim of the case to slide between the bolt face and the extractor claw and feed into the chamber. After firing or if you simply just want to remove the bullet from the chamber, pulling the bolt rearward, the extractor claw hangs onto the rim until the case hits an extractor bar causing the shell to fly out of the rifle.
A good question.
I would suggest a firearms training session. Check with the NRA or a local gun club for help.

When Co2 is used to propel a projectile the escaping gas is very cold - below zero cold - and water vapor condenses on metal and that causes the pressure in the chamber to drop to zero or so little that it can't move the pellet. If you are firing this as rapid fire strings I am surprised you got through two cylinders of gas.

Numrich Arms - now known as Gun Parts Corp is your best bet.

Contact Crosman Customer Service. You can send it back to them and get it refurbished with all new parts.

From the manual -

Step #5-The barrel, receiver and action
are now ready for thorough cleaning. The
action should be cleaned in solvent, dried,
and oiled sparingly prior to reassembly.
Further disassembly of the action is not
recommended and should only be
attempted by a qualified gunsmith or the
factory.
************************
I highly recommend you have a professional gunsmith further disassemble they rifle. They have tools and skills that are required to go beyond further disassembly of the action and bolt assemblies and are aware of the spring loaded parts that will fly out of the part upon removal of parts. That being said, the bolt is held together with pins that retain the extractor and the firing pin. They are removed by drifting them out with a punch small enough to pass through the hole the pin is in. All spring bound parts and springs/plungers will "spring forth" when the retaining pin is removed, and unless you know what is under the part between the bolt and the inside of the part, you will lose what ever presses on the back of the part and provides the spring tension grip it has on the case rim.

smith and wesson victory bolt problems Google Search


Hope this helps. Not sure of your specific problem. I am happy to chase down any more info if you require

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If you're getting a good dent, it's the ammo, not the gun. The good dent is all you hired the firing pin and spring to do. They did their job....don't blame them for the screwed up part time workers.

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwir8pyq_PXfAhVB4IMKHckRDY4QFjAAegQIChAC&url=http%3A%2F%2Fwww.mossberg.com%2Fwp-content%2Fuploads%2F2017%2F05%2F12173-Owners-Manual-Pumps-English_REVABweb.pdf&usg=AOvVaw0EL7tRtP4AlaKV61dqThZm

What's it doing/not doing?