Bren 30-06 barrel with fluted chamber

[Daan Kemp]

These have been around as long as we have...Not new. They aid in extraction.

Usually in firearms with violent extraction cycle, to prevent cases sticking in the chamber or rim torn off.

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[browningautorifle]

in firearms with violent extraction cycle

Yes. Interestingly...there was a discussion over in the M14 forum about them being the very thing that tears off a base. I don't agree though. Like you say, to prevent sticking.