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Question about ejector spring


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I have a few AR’s and I have noticed sometihing with them that I have not seen before. I’ve spent many years in the military and never saw this on any of our M4’s or AR’s.  I have found some small o-rings on the ejector spring on my newer AR’s.  Can anybody give me some information concerning why this is done and what benefit these o-rings offer. 


Thank you,


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