P7 Chamber Fluting

J

jaughtman

New member
Hey! Been a while since I posted, but I am back! LOL. Recently acquired another HK P7 and in looking it over, the flutes in the chamber of this one appear to be deeper and sharper-cut than the flutes in the chamber of the one that I shoot/carry regularly. Do the flutes "wear down" over time much like barrel rifling? Had never noticed it until holding two up against each other to compare. The new one has been shot/used far less than the one that appears to have the worn flutes. Thanks!

Jaughtman
 
Flutes on a barrel are usually the term for the outside of the barrel.

Lands and grooves are the transitional rifle barrel twisty you see.

Valleys and hills for the P7 cold hammer forged polygon bore barrel which are claimed to be tighter seal for better pressure while less build up, tearing of the copper jacket, dirtiness, and wear. Blah blah blah on if any of that is true.

Now you are saying the valleys and hills are reduced one to the other? One thing to consider, the age difference might be a manufacturing difference or even variation between barrel make?

A cold hammer forged polygon bore barrel probably isn't seeing a decrease from use for a long while, nor a conventional barrel. Unless you are saying you've shot the living crap out of the gun with 10xs of thousands of rounds?

Informative sight on barrel types. And you can see how "ballistics" can pull barrel patterns from a bullet: https://www.firearmsid.com/A_bulletIDrifling.htm

The most accurate duty gun I've owned is multi PPQs which had traditional and then changed to poly rifling. No change what so ever in my hands.

P7s are a religion. I look forward to people giving you better information.
 
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Sorry wildcat the P7 CHAMBER is fluted to ease extraction with its odd gas retarded blowback action.

J., I never heard of the flutes wearing. Does the older gun still function reliably?
As I recall, the original Graygun had an unfluted chamber.
 
the tools that make the barrels wear out with time. I suspect the flutes in one may have been cut with more worn tooling than the other, while still being within specs.
 
Thanks, all!

Flutes on a barrel are usually the term for the outside of the barrel.
Click to expand...

*Yes, unless you are dealing with a P7. LOL. Fluted chamber is just one of the many innovations that make these things dear to my heart. I am going to assume just since this one is older it was due to the machining. Still functions just fine - is my faithful bedside-gun.
 
I suspect any difference is in tooling adjustments made over time rather than wear. HK steel in very hard and durable.

Here's a photo...
 
Those flutes also allow the gun to function if the extractor breaks or goes missing.
Love both of mine; but they are getting PRICEY!
 
That is a great picture showing how the flutes extend ahead of the case mouth to admit gas to "float" the empty out of the chamber. It also shows the location of the port to the retardation cylinder, getting high pressure.

I still pick up the occasional striped case on the range, not just P7 but there are a couple of live legal MP5s in town.
 
Brass is not deformed and is reloadable. The brass has carbon marks where the brass is "floating" in the chamber but no other difference than any other regular smooth chamber.
 
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