Suppressor on Ruger PC9 Carbine?

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ETS
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Suppressor on Ruger PC9 Carbine?

Post by ETS » Mon Jul 18, 2005 4:22 pm

Hi,
I wanted to know if anyone has put a suppressor on a Ruger PC9 (9mm police carbine)? I have one and was going to have the barrel threaded or have a 3-lug adapter attached to it. Any opinions?

Thanks,
Kirk

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Kevin/AAC
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Post by Kevin/AAC » Mon Jul 18, 2005 6:28 pm

We have one in 9mm that we shortened the barrel on and reinstalled the sight. The barrel is about 10" and threaded .5-28tpi. It suppresses decently, but the ejection port noise seems excessive. It is fairly loud to the shooters ear. No one here really ever shoots it... I even forgot that we had it until you brought it up. I guess it isn't very popular, even here where employees could shoot it for free. Everyone seems to like the Beretta Storm rifle here, it gets shot a lot.

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Post by Tugnut » Mon Jul 18, 2005 7:32 pm

So the Storm doesn't have excessive action noise like the Ruger? What did you do, just slap a muzzle can like the Evolution on it?

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Rob
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Post by Rob » Mon Jul 18, 2005 9:30 pm

How does the action noise compare to an UZI or MP5?

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Post by Kevin/AAC » Mon Jul 18, 2005 10:21 pm

We put a Phantom on it.

The action noise is excessive. It is much greater than the Uzi or the MP-5. The closest thing that comes to mind is the action noise of the Marlin Camp Carbine.

The action noise of the Beretta seems to be softer for the shooter than the Ruger.

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Re: Suppressor on Ruger PC9 Carbine?

Post by dtp » Mon Sep 23, 2019 2:07 pm

Ruger PC9, as far as I'm concerned is not hearing safe with the MysticX or Rugged Obsidian 9. I've tried with Freedom munitions hush, various 147gr subsonic loads, not good at all. I wouldn't bother trying to suppress this guy without at least wearing foam ear plugs. But I admit Freedom munitions at 870FPS did not leave my ears ringing, but was not comfortable at all.

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Re: Suppressor on Ruger PC9 Carbine?

Post by ECCO Machine » Thu Sep 26, 2019 11:34 pm

The port pop on those is real. I did a huge volume integral for a fellow, a 1.75" ID with a 1.375" OD three cone, ten K baffle core and a the rest of the volume a big honkin' coaxial chamber to reduce backpressure, and even that was snappy to the ear (silly quiet if you held the bolt, closed, though. Which hurts). One of the problems, though, is that the takedown feature precludes porting or shortening the barrel below 5.5".

There are much better 9mm PCC hosts.
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Re: Suppressor on Ruger PC9 Carbine?

Post by a_canadian » Fri Sep 27, 2019 1:26 pm

Hi ECCO. Sounds like you've tested holding the bolt closed, if you're saying it hurts. So I'm wondering if you have a guess as to how much metal might be needed to assure reliable, durable bolt restraint, as an add-on for a 9mm PCC. Have a different model of 9mm takedown carbine and more specifically I'm wondering if 2 x 10-32 threaded holes in 6061 with at least 4 full turns into it with common stainless bolts will suffice against the back pressure of normal subsonic 9mm loads. I'm thinking I could make a simple 2-part lever with a cutout to drop tightly onto the bolt handle, converting the carbine into a single shot.

The lever portion would be hinged to a plate bolted to existing threaded holes in the action, using a substantial diameter hinge pin. The hooked portion restraining the bolt handle would normally be at rest, thanks to gravity, with a swing stop set at maybe 15° below the bolt, lifted into position and clipped into the bolt handle for quieter suppressed fire, dropped out of the way to manually cycle. A strong magnet embedded opposite the stressed side of the hook would likely be sufficient to keep it in place before firing. The bolt handle would be machined such as to present a fairly large contact area to the hook.

Seems to me the mounting holes are the potential weak link at 10-32 scale. I could bore and rethread to 1/4-20 if you think it's necessary. I'm used to the stresses of .22lr so this is new territory, not entirely sure how to intuit the load with heavier grain weight 9mm subs. I know from one field test with a semi-integral suppressor mounted (ported threaded mounting plug, 11" of OTB volume, 1.375" ID tube, 6" of shallow clipped cones in front) that it's definitely kicking hard, but hearing safe by a significant margin with zero FRP. I'd enjoy the thing more in the woods as a pseudo bolt action though, with a smaller (9" OAL) K baffled muzzle can. I'll probably machine a new bolt handle for this, with tighter tolerances than the slightly wobbly TNW bolt handle.

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Re: Suppressor on Ruger PC9 Carbine?

Post by ECCO Machine » Fri Sep 27, 2019 9:50 pm

a_canadian wrote:
Fri Sep 27, 2019 1:26 pm
Hi ECCO. Sounds like you've tested holding the bolt closed, if you're saying it hurts. So I'm wondering if you have a guess as to how much metal might be needed to assure reliable, durable bolt restraint, as an add-on for a 9mm PCC. Have a different model of 9mm takedown carbine and more specifically I'm wondering if 2 x 10-32 threaded holes in 6061 with at least 4 full turns into it with common stainless bolts will suffice against the back pressure of normal subsonic 9mm loads. I'm thinking I could make a simple 2-part lever with a cutout to drop tightly onto the bolt handle, converting the carbine into a single shot.

The lever portion would be hinged to a plate bolted to existing threaded holes in the action, using a substantial diameter hinge pin. The hooked portion restraining the bolt handle would normally be at rest, thanks to gravity, with a swing stop set at maybe 15° below the bolt, lifted into position and clipped into the bolt handle for quieter suppressed fire, dropped out of the way to manually cycle. A strong magnet embedded opposite the stressed side of the hook would likely be sufficient to keep it in place before firing. The bolt handle would be machined such as to present a fairly large contact area to the hook.

Seems to me the mounting holes are the potential weak link at 10-32 scale. I could bore and rethread to 1/4-20 if you think it's necessary. I'm used to the stresses of .22lr so this is new territory, not entirely sure how to intuit the load with heavier grain weight 9mm subs. I know from one field test with a semi-integral suppressor mounted (ported threaded mounting plug, 11" of OTB volume, 1.375" ID tube, 6" of shallow clipped cones in front) that it's definitely kicking hard, but hearing safe by a significant margin with zero FRP. I'd enjoy the thing more in the woods as a pseudo bolt action though, with a smaller (9" OAL) K baffled muzzle can. I'll probably machine a new bolt handle for this, with tighter tolerances than the slightly wobbly TNW bolt handle.
You would need to lock the bolt by means other than the handle. Just a few rounds holding that bolt handle, at first directly with my hand, then with a piece of 2x4 in my hand, it started to bend the knob.

My suggestion would be to go en entirely different route. Either something locked breech or delayed blowback, or rebuild a Suomi kit. The really heavy bolt in the Suomi makes it a pretty pleasant host.

The Ruger bolt speed is just too high, like the Marlin camp guns. My Camp 45 is definitely not hearing safe with the port pop. And even worse than that is my home built 9mm folding carbine with it's 12.2 oz bolt that barely stays closed long enough to prevent case head ruptures.

As for guys above talking about the CX4 being decent; I don't share that opinion. Suppressed CX4s snap my ears, too.
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Re: Suppressor on Ruger PC9 Carbine?

Post by a_canadian » Fri Sep 27, 2019 10:18 pm

Thanks a lot for your insights. I'll not waste my time and risk damaging something with that little project. In the case of the TNW Aero, perhaps the more significant bolt carrier weight and the chunk of steel they put into the front of the spring is enough to keep port noise lower than those other examples? Because although my ears are if anything excessively sensitive (always plug my ears when people applaud around me, just hurts me, don't understand how it doesn't hurt everybody), the carbine with UMC 147gr is completely acceptable. Indoors or in the woods. Not Hollywood by a stretch, but not at all uncomfortable, let alone painful. I haven't tried anything else through it yet and probably won't, as this stuff cycles so well and delivers excellent accuracy.

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Re: Suppressor on Ruger PC9 Carbine?

Post by ECCO Machine » Fri Sep 27, 2019 11:35 pm

That's the nice thing about AR based carbines; can add lots of mass to retard bolt opening.
a_canadian wrote:
Fri Sep 27, 2019 10:18 pm
I haven't tried anything else through it yet and probably won't, as this stuff cycles so well and delivers excellent accuracy.
Try Fiocchi 158 gr. It's a little more expensive than the cheap 147 gr. stuff, but about the quietest factory load I've found that will reliably cycle most (maybe all) hosts suppressed.
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Re: Suppressor on Ruger PC9 Carbine?

Post by a_canadian » Sat Sep 28, 2019 12:20 am

Probably a decent choice, but I'm likely to stick with what's readily available. No Fiocchi 9mm showing up in any retailers to which I have access, though they seem to have that brand in .357 and .45. The Remington UMC cycles well, is reasonable on the ears, pokes holes close together on target, so no worries.

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