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TM M4A1, identify this piece (Not sure where it goes)
When I took apart and reassembled my M4, I found this piece on my desk. I am unsure of where it goes or if its important. If anyone has any idea what it is or where it goes it'll be a lot of help.
Its a small donut like ring with 3 prongs pointing towards the center, I attached a picture of it below.
Thanks again
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