Discreet Ballistics Patents a First Round Pop Reduction System

    Discreet Ballistics Patents Their First Round Pop Reduction System (1)

    A little over a year ago, we wrote about the Discreet Ballistics PopStop which is a barrel mounted valve and a CO2 cartridge system designed to inject a non-flammable gas into the suppressor replacing the oxygen inside the can thus eliminating the phenomenon of the first round pop. Back then, the PopStop was patent pending. Lately, Discreet Ballistics has announced that the patent (US 10,145,636 B2) has been issued.

    Discreet Ballistics Patents Their First Round Pop Reduction System (1)

    Discreet Ballistics PopStop mounted on a pistol

    The first round pop occurs at the first shot when the not completely burnt powder enters the can full of oxygen which supports the combustion resulting in a higher report and signature of gasses exiting the suppressor. It is not present at second and consecutive shots because the oxygen has been removed from the can. The first round pop normally happens in rimfire and pistol cans.

    Discreet Ballistics Patents Their First Round Pop Reduction System (2)

    PopStop used with a carbine

    It is interesting to note that if the currently available PopStop requires to inject the CO2 gas from an external source (CO2 inflator), the patent shows another solution for carbines with the CO2 cartridge integrated into the gun and controlled via an electrically activated valve and a remote switch (see the drawing below). According to the patent, such a system will be convenient for carbines not requiring to reach forward to inject the CO2 gas into the can.

    Discreet Ballistics Patents Their First Round Pop Reduction System (3)

    308 – valve; 310 – compressed gas source; 312 – gas supply tube; 322 – remote switch; 324 – battery

    Another interesting aspect is that the patent also shows a suppressor design with a valve welded or screwed directly into the first blast chamber area. The screwed option is preferable because it will allow replacing the worn out valve. Currently, PopStop is available only as a direct thread adapter that adds a valve between the muzzle and suppressor.

    Discreet Ballistics Patents Their First Round Pop Reduction System (2)

    I think this patent includes some great ideas which if executed properly can make a very cool suppression system. I hope in the foreseeable future, we will see a Discreet Ballistics carbine (or retrofit kit) with the integrated first round pop mitigation system.


    Images from www.discreetballistics.com, US Patent # 10,145,636 B2

    Hrachya H

    Managing Editor

    Being a lifelong firearms enthusiast, Hrachya always enjoys studying the history and design of guns and ammunition. He also writes for OvertDefense.com and SilahReport.com
    Should you need to contact him, feel free to shoot him a message at [email protected]


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