Ammo Jamming with Suppressor

[Prochambers]

Greetings all. Finally I made it to the range today to test out my new SilencerCo Omega 9k suppressor on my CZ SP-01. I was shooting with Federal Premium 9mm Ammo 124gr +P HST JHP (P9HST3) and I noticed that I would get jams when the suppressor was on the gun. But there would be no jams when I removed the suppressor.

Question? Do I need to move up to the 147 grain for the heavier weight? Please advise. Thank you.

[Wobbly]

Welcome Aboard !

I am not a suppressor guru, but the basics still apply....

1) All CZ's need 500+ rounds to be called "broken in". If you installed a new threaded barrel, then the same thing applies. You may simply need to shoot, clean and lubricate the gun several times before it operates as advertised.

2) Alternate recoil springs may need to be installed. I don't know of anyone (but I'm sure there must be some) who shoot an SP01 with the stock 18# (??) recoil spring. Get on the phone to Wolff Spring or Cajun Gun Works and get a selection of recoil springs, 18# to 12#.

3) Lastly you'll need a wide selection of ammo to try. Every ammo shoots differently in every gun. 124gr HST shoots great in my P10c and SP01, but I don't have a suppressor on either.


It's not about the bullet weight, it's about the energy. And you've added a lot of weight to the front of the barrel, which changes things when you consider the entire mechanism as a "system".

Hope this helps.

[Prochambers]

Thanks much for the information Wobbly. Time to purchase more ammo and get to shooting.

[aasbra]

What mount is on the suppressor?  Is there a Nielsen device/booster with a spring or fixed mount?  If fixed mount, I would try a booster/Nielsen device.

I have several CZ suppressor ready models (sp-01, P-09, P-10c) and haven’t experienced any feeding issues with an octane 9 and octane 45 when mounted with the supplied silencerco booster, even when running the factory recoil springs.  I typically run subsonic hand loads, mostly 147 grain, but am pretty sure I have also ran my 125 grain mid-range hand loads with the suppressors without issue.  I would think 124 grain +P would reliably cycle given my experience.

As Wobbly said, a new CZ will be a little stiff and benefits form some rounds down range to wear in a bit.


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[Prochambers]

It's a fixed 5/8x24 thread mount. Also, has booster retaining ring and spring (no piston) which all came in the box. Also, totally forgot that I also ran Speer 124 JHP through the suppressor with no jams at all.

[aasbra]

It's a fixed 5/8x24 thread mount. Also, has booster retaining ring and spring (no piston) which all came in the box. Also, totally forgot that I also ran Speer 124 JHP through the suppressor with no jams at all.

I would double check the literature that came with your suppressor, but my understanding is a booster/piston is needed for handgun applications where the barrel is not fixed mounted, such as your CZ SP-01 for the gun to cycle reliably with the suppressor mounted.  This article addresses the issue:

https://www.silencercentral.com/blog/suppressor-pistons-a-key-component-of-handgun-suppressors/


I run a fixed mount on my Octanes, or a spacer on the piston rather than the spring, when I am using it on a fixed barrel application (CZ 527 300 BLK, and other handgun caliber carbines that I have).  When using it them on my handguns, I use the appropriate threaded piston with the piston mount and spring.  No issues for me with this configuration.

[Prochambers]

It's a fixed 5/8x24 thread mount. Also, has booster retaining ring and spring (no piston) which all came in the box. Also, totally forgot that I also ran Speer 124 JHP through the suppressor with no jams at all.

I would double check the literature that came with your suppressor, but my understanding is a booster/piston is needed for handgun applications where the barrel is not fixed mounted, such as your CZ SP-01 for the gun to cycle reliably with the suppressor mounted.  This article addresses the issue:

https://www.silencercentral.com/blog/suppressor-pistons-a-key-component-of-handgun-suppressors/


I run a fixed mount on my Octanes, or a spacer on the piston rather than the spring, when I am using it on a fixed barrel application (CZ 527 300 BLK, and other handgun caliber carbines that I have).  When using it them on my handguns, I use the appropriate threaded piston with the piston mount and spring.  No issues for me with this configuration.

Sorry my mistake. I copied and pasted some of the information and should of said..."and piston" instead of "no piston". So the piston was inside the suppressor. Any thoughts?

[aasbra]

I f you have already considered/addressed Wobbly’s points, I would contact Silencerco and see if they have any suggestions.  I can’t think of any other reasons that would be causing the issue if you are using a booster piston.

[Prochambers]

I f you have already considered/addressed Wobbly’s points, I would contact Silencerco and see if they have any suggestions.  I can’t think of any other reasons that would be causing the issue if you are using a booster piston.

Will do! Thanks for your feedback. Take care!

[nkresho]

I agree with everything above and recommend checking lube in the piston oring. You should have free movement when pulling outward with the can installed (with the resistanceof the spring).  I use super lube on mine pretty regularly. 

Also,  124 +p should be plenty to get the slide moving, as was stated above.  Going to 147s is typically when you go with lighter subsonic loads.  They're way quieter.

What type of jam are we working with?  Stovepipe or fail to return to battery?  Something else?

Depending on the number of rounds too, you might have gotten the gun gunked up from the blowback, slowing the slide movement just enough for a malfunction.  A suppressor will get a gun dirty exponentially faster than without.

I hope this helps.

[Prochambers]

I agree with everything above and recommend checking lube in the piston oring. You should have free movement when pulling outward with the can installed (with the resistanceof the spring).  I use super lube on mine pretty regularly. 

Also,  124 +p should be plenty to get the slide moving, as was stated above.  Going to 147s is typically when you go with lighter subsonic loads.  They're way quieter.

What type of jam are we working with?  Stovepipe or fail to return to battery?  Something else?

Depending on the number of rounds too, you might have gotten the gun gunked up from the blowback, slowing the slide movement just enough for a malfunction.  A suppressor will get a gun dirty exponentially faster than without.

I hope this helps.

I did check the lube in the piston oring and it seemed sufficient. What brand super lube do you recommend? Just in case I need to try something different. Three times I got Stovepipe jams and twice it was a double feed but only using the Federal ammo. The Speer 124 ran fine! Also, I noticed that I was receiving more blowback using the Federal ammo. This was the first time running the suppressor and I know I need to run 100's more of ammo through to get the gun broken in. I will also try some 147 to see how it operates. Thanks for your feedback!

[nkresho]

The stuff harbor freight has. I think super lube is the brand. It's silicone based which is the important part.

As long as it's moving freely though you should be good. Mine start to lock up when the piston housing needs an ultrasonic bath

[Prochambers]

The stuff harbor freight has. I think super lube is the brand. It's silicone based which is the important part.

As long as it's moving freely though you should be good. Mine start to lock up when the piston housing needs an ultrasonic bath

Thanks.