guys which O-ring works behind the extractor? i dont want to spend 9 bucks on shipping for such a small part. thx
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guys which O-ring works behind the extractor? i dont want to spend 9 bucks on shipping for such a small part. thx
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his was originally posted by pat rogers in 2006
"Roger, different. The #60 "O" rings commonly available would work for a short time in a pinch (and i have used a whole bunch of them on my guns as well as others).
Having said that, we were able to purchase a great quantity of the Crane type at a significant savings."
take it for what its worth. i know i saw another mention of #60 somewhere else on here. ill look some more.
Honestly the Bravo Company extractor upgrade kit is more than worth it. I honestly think the correct insert along with the correct spring is a lot more important than the O-ring.
As a matter of fact I was having issues running the O-ring in my LMT 14.5". There was too much extractor tension. It was shaving brass from the cartridges and causing the ejector to become stuck. Removed the O-ring, problem solved. I only use the O-ring when running Wolf or Barnaul steel cased ammo.
The ones that I have just gotten are from McMaster-Carr #75 Viton Size 006, 1/8" ID & 1/4" OD. ETA: Part # 9464K11 = $5.22/100.
1201T16 - the mil-spec version. (apparently more solvent-resistant)
McMaster-Carr - if they don't carry something, that's because you don't need it :)
EXACTLY. I wouldn't go puting plumbing shit in a gun just because a lot of people on the internut do it.
In fact... as I always say.... I wouldn't keep a gun that needed an o ring to run.
And as pointed out... the BCM bolt or kit runs on everything I own from 11.5" to 20" rifle.
The kit BCM sells says you likely will not need the O-ring, but they included it anyway.
I just installed one of the BCM springs tonight, sans o-ring (actually, this thread reminded me I needed to do it)
It makes a huge difference in tension, you can feel the difference just in trying to move the extractor by hand. (or during install, the old spring squashes easy during removal, the new one... not so easy to squash:) )
In a class setting yesterday, Ned Christianson related that he had done some testing from six various vendors of six extractor springs from each vendor and found that even within the same manufacturer, there was a wide variety in performance. The O-ring is not a perfect solution (provided you get one that doesn't disolve in gun oils/solvents or melt from the heat) when compared to the D-ring version. The O-ring is not tapered or angled (when viewed from the side) like the D-ring. Now that difference could amount to some inconsistency in pressure to the extractor. The other side of the coin is what you have access to and/or what you can afford. The O-rings run aobut 0.05 to 0.10 each where the D-ring is $10.00.