Threaded barrel

Will you be offering an accessory threaded barrel?

Would this pistol work well with a can?

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Replies to This Discussion

Permalink Reply by Arne Boberg on March 1, 2012 at 5:45pm

What would work on the current XR9-S, with extended barrel, would be suppressor that would spin freely on the barrel.

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Permalink Reply by jradz on March 1, 2012 at 9:58pm

They're apparently called a "Nielsen device". AAC calls theirs an A.S.A.P, everyone has a different one. They talk about them on their websites and in their catalogs.

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Permalink Reply by Rveach on March 27, 2012 at 8:51pm

I wrote out a long reply then lost it. Anyway, a fully rotating mount would change the point of impact (POI) as the suppressor spins but is probably the only universal solution. Is there any way to prevent over tightening is using left-hand threads? I've got cans and a XR9-s but no way to attach the two.

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Permalink Reply by Paul Koning on March 28, 2012 at 8:13pm

Why would allowing the suppressor to spin alter the point of impact?

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Permalink Reply by Rveach on March 28, 2012 at 8:40pm

I'm not an engineer (or a photographer) but I assume its because the internal baffles arent symmetrical and there is different pressure or turbulence around the bore. Just my guess as to why. Not a huge issue at pistol distances but POI shift is real and needs to be considered.

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Permalink Reply by PATRAT on March 29, 2012 at 12:10am

If that turns out to be an issue, you can allow the suppressor to spin freely relative to the barrel, but add a guide rail to the slide (front sight attachment?) which will key it to the same location every time.

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Permalink Reply by Martin W. on March 29, 2012 at 1:40am

A Nielsen device will NOT help the Boberg cycle as it decouples the axial inertia and imparts rearward force. They do not decouple rotationally as the Boberg would require.

Having a can which spins freely around the barrel is very easy to make, but does not currently exist. A light can of small diameter might work (AWC Abraxas, 3.3 oz, 1in diameter), but I don't know the properties of the locking collar that Mr. Boberg tried. Most German muzzle threads are left handed and the standard 9mm thread on modern HKs and Sigs is left hand, so that isn't a problem.

A freely rotating suppressor would affect point of impact, but with a pistol round, at pistol ranges and pistol accuracies, it might not even be noticeable (assuming it is very precisely made). Furthermore it could only decouple for the cycling and lock-up again at the same location when cycling is complete. My main concern would be the weight of the can putting extra stress on the barrel locking points and causing accelerated wear. Another option is for the can to be of fixed design, but to have a type of muzzle brake (gas deflector) at the end that imparts a spinning motion (similar to russian gas powered gatlings).

I would be interested in suppressing the XR9-S as it seems ideal, being short and having a longer than normal time for the breech to open. I would definitely get a threaded barrel for mine if I could when I come up on the wait list.