Unburned powder blowback with suppressor

[joken]

I fired three 9mm handguns yesterday with my new suppressor. They all cycle fine, G-19, Sig 320, and a CZ 75 Omega. The CZ is blowing a lot of unburned powder in my face, the other two do not. The CZ is Cajonized and has a lighter recoil spring and I'm wondering if this is the problem or if it's characteristic of the gun.

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[Member 34319]

It's the guns action. If it is unlocking the breach too early, you'll get gas. I'd definitely try a heavier recoil spring and see if it will slow it down.

 

[Twodogs]

I shoot titegroup with a 147gr bullet, less powder helps blow back, kept blowen extractors out of my p-320 sig told me it was because I was not using their suppressor sold the sig now shoot a G-17 with no problems.

 

[aasbra]

As Reno suggested, I'd try a heavier recoil spring in the CZ. I have several CZ 9mm handguns (sp-01, P09, and P10c) that I run suppressed. They all run fine, but definitely do get dirtier in the action/mag well area when firing through a suppressor. Although all 3 of them do have some Cajun Gun Works upgrades, I generally stick with the standard CZ main spring vs. going lighter.

Also, what ammo are you using? I run handloads in mine, typically 147 grain plated bullet over a lighter charge of fairly fast burn rate powder (most recently using Alliant Sport pistol).

 

[joken]

I handload and also prefer 147gr but most of my ammo is my cast lead or coated lead that I purchased. I was shooting titegroup and some jacketed bullets whose name has temporarily escaped me. I also shot some police frangible cartridges that I have no data on. I need to order some bullets.

 

[joken]

As Reno suggested, I'd try a heavier recoil spring in the CZ. I have several CZ 9mm handguns (sp-01, P09, and P10c) that I run suppressed. They all run fine, but definitely do get dirtier in the action/mag well area when firing through a suppressor. Although all 3 of them do have some Cajun Gun Works upgrades, I generally stick with the standard CZ main spring vs. going lighter.

Also, what ammo are you using? I run handloads in mine, typically 147 grain plated bullet over a lighter charge of fairly fast burn rate powder (most recently using Alliant Sport pistol).

.

 

[aasbra]

Since you handload and have CZs, you probably know that CZ 9mms can have a fairly short leade in their chamber. So the ogive on certain projectiles require seating the bullet deeper than on some other manufacturers' barrels. I generally load and shoot 124/125 grain coated projectiles, but for the heavier 147 grain subsonic loads, I've mainly used the Berry's plated since I know they have worked in the CZ barrels I've loaded for while seating them with a reasonable OAL (not too short).

 

[joken]

Funny, I just ordered 1000 Berry's. Thanks for the advice. Ken

 

[Nwcid]

I handload and also prefer 147gr but most of my ammo is my cast lead or coated lead that I purchased. I was shooting titegroup and some jacketed bullets whose name has temporarily escaped me. I also shot some police frangible cartridges that I have no data on. I need to order some bullets.

You may want to do some reading on non-jacketed bullets and silencers if you have not done so already. Typically it is not recommended as it can increase leading in the can.

 

[joken]

Gotcha, I have ordered some Berry's plated.