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eth727
09-20-2015, 9:09 AM
I was wondering where does the O-ring go when assembling the extractor? Does it seat into the bolt body or is it rolled all the way down on the spring on the extractor?
Thanks

saudadeii
09-20-2015, 9:11 AM
Take your pick. (pun intended).

https://www.google.com/search?q=ar+15+extractor+o+ring&client=opera&hs=5Hj&tbm=isch&tbo=u&source=univ&sa=X&ved=0CDQQsARqFQoTCK6Uw4eAhsgCFYaaiAod6G0HtQ&biw=1680&bih=941

FeuerFrei
09-20-2015, 10:15 AM
http://www.gandrtactical.com/images/archive/STAG/CRANE%20O-Ring.JPG
Use it if you're having extraction problems otherwise save it in your parts box.
Better to use good quality spring instead.
IMHO...

eth727
09-20-2015, 1:37 PM
It came with it(Anderson) BCG already installed. I had to take it apart to check my headspace. For some reason the firing pin was binding when I reassembled it. I removed the extractor and the spring was tweaked. I fixed it but forgot which side the o-ring went.

FeuerFrei
09-20-2015, 4:21 PM
Good deal!
Headspace okay?


Sent using a long string & 2 cans.

ar15barrels
09-20-2015, 10:37 PM
The O-ring will sometimes cause problems on midlength or rifle length gas system barrels.
I would only use it on a carbine gassed 5.56.

eth727
09-21-2015, 4:23 AM
Wow I didn't know that. I'm glad that people are helpful on these forums. This is my first build of an AR or any kind of gun for that matter. I went on the instructions of everything I read or saw online. Every gun I ever owned Either came some type of literature or I bought printed material for that weapon.

Old Iron
09-29-2015, 11:15 AM
I'm new to the modern AR platform. Was that O-ring part of the design change to carbine gas system? I wouldn't think that an o-ring would hold up well in service. Seems like a stronger spring would be a whole lot better of an idea. I never saw anything like that on the rifles.

ar15barrels
09-29-2015, 2:55 PM
I'm new to the modern AR platform. Was that O-ring part of the design change to carbine gas system?

The O-ring is a bandaid for the Carbine gas system.