Does anyone make an AR barrel with a fluted chamber?
Larue’s XTRAN chamber has flutes along the case body. Used in the OBR. The barrel is a Lothar Walther, but I don’t know if Larue is finishing the chamber or if LW is.
Haven’t seen anyone else doing it.
Thanks. I’d like to build one up…
Whats the purpose of fluting a chamber? I know the G3 rifle had this to aid in extraction? Are there any other benefits?
Fluted chambers are pointless in an AR-15. The main purpose is to channel to gas back to the surface of the case for a little push to aid in cycling in roller locked weapons.
Brass that has been run through a fluted chamber generally can’t be reloaded.
Understood. I can imagine this causing trouble in an AR15 rifle, now that im thinking about it.
XTRAXN™ is a proprietary chamber feature added to reduce frictional forces caused by pressure-expanded cartridge cases bearing against chamber walls. Facilitates reliable extraction through a wide range of temperature / chamber pressure extremes. XTRAXN™ extends extractor life, while having no effect on the firearm’s accuracy. All this, and it dovetails well with the OBR’s world-famous accuracy.
What’s the story on that?
Come on…
You really have to quote all the photos? Seriously?
That is the xtraxn chamber from Larue, and what it does to brass.
Edited it. Is that better?
Much better.
Thank you.
9mm brass from a MP5 looks the same. 
P.T. Barnum was right. :blink:
My God, that’s a line of salesman horse shit.
Not gonna touch what the flutes are supposed to do ,but what makes this brass unable to be reloaded.
Nothing. I’ve reloaded plenty of brass out of roller lockers. The M1A/M14 is harder on brass. The flutes don’t hurt anything…but without a port buffer, the big honking dent in the body of the case is what can jack up brass from a roller locker.
The Sierra reloading manual used to carry a warning about reloading brass that had been through a fluted chamber. They recommended using a FL sizing die. My experience has shown that FL dies work the brass to hard and you will be lucky to get 2 reloads out of it before it cracks.
Now, I don’t work for Magpul but I did stay at the Holiday Inn last night…:dirol:
You can do a lot of things in reloading that aren’t worth the hastle… including reload steel cases.
When I find fluted brass, it goes straight into the recycler. Usually the gun it’s been fired in will have destroyed the rim anyway. Fluted brass is generally completely fuXored up and not worth the hastle.
When the brass cracked were the cracks along the flutes or at the shoulder? I’m really just curious, not gonna have a weapon like this anytime soon.
I had a boutique manufacturer ask me to get some chambers fluted a couple years ago (AR15). I told him that for the expense of it, I didn’t think it’d be worth it, and that I was concerned that being a rotating bolt design, it might impede function more than anything else. The systems that were originally designed with a fluted chamber to aid extraction-- the HK’s, CETMEs, StG 57, the FAMAS-- none of them have a rotating bolt.
Question: when an AR unlocks by rotating the bolt, does the case turn with it or does the bolt turn on the case? My observation has been that it does whatever it feels like-- turns, doesn’t turn, turns part-way.
I can imagine that with flutes, the fired case doesn’t turn in the chamber as the bolt unlocks. But I’d say it looks like LaRue has proven that this is not a concern. Not sure I’m sold on it as an improvement, but on the other hand I can’t feature an outfit of their standing offering this without having proven that it helps at least on a theoretical level. I just can’t see them offering something that is not proven to at the very least, cause no harm.
It it just me or is there a very, very slight helix to the “flute prints” on the cases?