Bren 30-06 barrel with fluted chamber

[browningautorifle]

Bet the spent brass looks ... interesting!

You've never seen anything coming out of an HK 33 or 91 or 93? Or a G3? They all have fluted chambers too, the MP5 should have too. They all allow positive extraction but are very hard on brass. They weren't meant to supply reloaders with brass.

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[RASelkirk]

You've never seen anything coming out of an HK 33 or 91 or 93? Or a G3? They all have fluted chambers too, the MP5 should have too. They all allow positive extraction but are very hard on brass. They weren't meant to supply reloaders with brass.

No, I didn't even know this type of chamber existed. What would be the purpose? Obviously, the mfg'ing expense would be much higher so I must assume some type of benefit...

Russ

[browningautorifle]

I didn't even know this type of chamber existed. What would be the purpose?

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

[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.

[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.