O-ring with BCG

[kidicarus13]

I purchased a BCG online and along with it the company sent a small O-ring. I found what the O-ring is for using Google but what is everyone else's experience using them? I have never used over before and have never had a problem. Overkill?

[ray1970]

Probably overkill but all of mine have them. It just adds some extra tension to the extractor. I think.

[colorider]

All of mine have them and came with them. Thousands of rounds through all of them with no problem. I think it makes the extractor get a strong hold on the casing.

[Great-Kazoo]

Sounds like it's either a spare, or an option to install. See how it runs without, first.

[Guylee]

I've never had problems with FTE with my guns, but I know a lot of people that swear by them. Shouldn't hurt either way.

[Bailey Guns]

I suppose if I were selling them, a part that's a penny or two to make, for $1 or more, I'd say you definitely need one and you need to replace it every hundred rounds or so.

[BPTactical]

Back when the extractor buffer was rubber they gave a bit of extra Insurance. With the new polyurethane buffer material they are unnecessary.
Run it if ya want but you aren't going to run a semi hard enough to see any difference.

[beast556]

I never use them. I change all 16in carbine length gas system to bcm extractor springs. I leave my middie and 20in guns with the regular spring.

[bobbyfairbanks]

They really shine when using steel case with high rd counts in between cleanings. Other wise not really needed but you got it so might as well use it