Unknown "O" ring appeared while cleaning

[CaptAhab]

Had a great day at the range with my new sport. While cleaning afterwards I found an O ring that may or may not have come out of the bolt carrier group. When I clean, I disassemble the bolt carrier group and let the parts soak in solvent while I clean the barrel. When I went to reassemble I found an o ring that I had not seen before. The inside diameter is the same as the firing pin. Any help would be appreciated.

 

[Trash Can Man]

Here's an exploded view, I don't see an O ring in the BCG?

 

[SimpleWeaponSolutions]

Did you remove the extractor from the bolt? If so it could be the oring from the extractor.

 

[Mustang5L5]

Was just going to suggest the o-ring under the extractor


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[CaptAhab]

Did you remove the extractor from the bolt? If so it could be the oring from the extractor.

Yes I removed the extractor. It appears from your photo that the o ring goes over the extractor spring. Is that correct?

 

[2hawk]

Not SWS, but yes, over the extractor spring.

 

[BillyJack2012]

This raises a good question. Are you guys removing the extractor for cleaning?

 

[Mustang5L5]

I actually use an ultrasonic bath to clean my bolt.

A little simple green and water, and 1hr in the bath. Take it out, dry it off and oil it up. Works very well. I do it after every session.


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[MichiganScott]

This raises a good question. Are you guys removing the extractor for cleaning?

And another good question is "Why?"