Question about ejector spring

[Johnsonjf]

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,

Jeff

[FreQRiDeR]

I believe it helps keep the crud and brass shavings out and helps prevent it seizing, since most people never clean theirs properly. Lol

[jtallen83]

Also supposed to help spring life by containing it, the armalite kit even uses a plug inside to further contain it. Not a metallurgist so I cannot adequately explain this feature.

[98Z5V]

More spring tension on the extractor - that's where they're at, around the spring.  Never seen one on an ejector spring before.

[jtallen83]

Totally missed that, only ever seen the O-ring on extractors so that is what my brain read.