BCM BCG??

[LOBO]

In the package with my BCM BCG was an O ring. Is this a spare?

[Dos Cylindros]

No, they don't usually come with the O ring installed on the extractor spring. If you are running a middy you likely won't need it. They leave it off and give you the option of installing it if you see fit.

[Ryno12]

Perfect candidate for the search button. This has been asked many'o times. The o-ring is optional.

https://www.m4carbine.net/showthread.php?t=79681

https://www.m4carbine.net/showthread.php?t=31481

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