If you recall, James posted a video about the myth that the MPX is dirty when suppressed. Some people say the MPX produces gas to the face when supressed.


He was running an AAC Evo-9 and did not experience any issues.

I had experienced gas to the face with my friend’s MPX and Octane 9 set up. Click here to refresh your memory.

Well just last week I think I have found the worst setup. I am using a Rugged Obsidian45 on my Gen 1 MPX. Shooting 147 grain reloads using Montana Gold bullets and Hodgdon Tite Group powder.  I had used dB Foam in the Obsidian several hours earlier and the smoke may be residue burning off. I have a Franklin Armory Binary trigger in the MPX and the rapid fire does not allow the gas and smoke to dissipate compared to slower semi auto rates of fire.

Here is the video, you can see the obscene amount of smoke and gas. It is like I have created my own weather system.

I will have to revisit this setup after the Obsidian is clean of any residue.

Edit: So I rinsed the can and let it dry over the weekend. I just went and shot it today and sure enough, no smoke.


  • James Reeves

    Nice follow-up. Forget about smoke grenades, just run DB Foam and an MPX and you have all the concealment you need.

    • SP mclaughlin

      Integrated smokescreen!

    • DW

      Literally ninja

    • iksnilol

      Yeah, but then you’d lose the advantage of your enemy being distracted oogling you in your tight shirts.

  • Rusty S.

    Almost like it was MPX: FFFg edition!

  • The Dude

    Brilliant story.

  • Nathan Alred

    Fog of war.

  • Juggernaut

    Reeves’ “BK Napkin Test” was hilarious

    • Pete – TFB Writer

      Me too.

  • BravoSeven

    If I use a certain suppressor with a MPX with intentions of creating smoke is that considered a redesign? If so, do I need a special letter to do so legally?

    • Rick O’Shay

      Better write the ATF and find out, just to be sure.

  • USMC03Vet

    Didn’t realize you could vape with a MPX, but now I do.

  • Uniform223
    • Vhyrus

      Come on, that picture’s only 4 years old.

    • USMC03Vet

      LOL not legal in California!

    • Sunshine_Shooter

      We get it, you vape.

  • lostintranslation

    Now laughing friends deride
    Tears I cannot hide
    So I smile and say
    When a lovely flame dies, smoke gets in your eyes.

  • 8166PC1

    tell a lie often enough and it becomes the truth

  • Haulin’ Oats

    We’ve now discovered a new way to Vape, MPX style.

  • Tite Group produces a lot of smoke IME. So Tite Group plus rapid fire, and maybe even that gel burning off can explain why you get more smoke to the face than the other guy that might be using factory ammo.

    • Swarf

      Load your can full of snake oil and you might have a problem, too.

      • I feel a “that’s what she said” joke coming on

  • Shaun Connery Oliver II

    Hey I would’ve gone with the black and white paint scheme, but I would make everyone run away. And here’s the worst part, I would’ve too.

  • Anonymoose
  • DanGoodShot

    I though most ranges don’t allow smoking?

  • Bill P

    I have a MPX that was cut to 4″ and has a Dead Air Ghost. With the wipe…gas. Without the wipe, no gas. BTW, the gun runs flawlessly in this configuration. Zero issues.

  • Christian Hedegaard-Schou

    Spends over $3000 on firearm, puts bottom-shelf China-tier optic on top.

    Seriously, I just don’t get it.

    • Nicholas C

      Actually it was only $1k. And I’m testing that optic.

      • Christian Hedegaard-Schou

        Sig MPX is $1800 or so. Plus $200 stamp. Plus $800 suppressor and other $200 stamp.

        So how’d you get $3000 worth of stuff for only $1K? And is that with or without the $400 worth of stamps?

        • Nicholas C

          Well the MPX was my friend’s and he sold it to me for $1000. The suppressor is on loan from SilencerShop so that doesn’t cost any money. The MPX is a pistol and using an adjustable SB Tactical Brace.

          Sooo yeah, it is a $1k gun.

  • Russ Kell

    Napkin jihadi. Still laughing. Omg.

  • Moosejaw

    Thinking about getting the Franklin Binary Trigger for my MpX. Any qwerks to
    know of? Install issues, Reliability issues, dangers, etc…..

  • “I filled my can with a foaming chemical agent, ignited an explosion behind it, and am now perplexed by all this smoke.”
    Seems legit.