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