View Full Version : AR15 extractor spring O-ring

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?

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


09-20-2015, 10:15 AM
Use it if you're having extraction problems otherwise save it in your parts box.
Better to use good quality spring instead.

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.

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

Sent using a long string & 2 cans.

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.

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.

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.