Vepr12 Ejection Port Fireball

Here is a video my friend Brian Miller shared with me. He is testing out a new muzzle brake, he made for his Vepr 12. Check out the second shot. A sizable fireball come out of the ejection port. Is the bolt opening too soon and unburnt powder is escaping out of the ejection port? It looks cool though.

Nicholas C

Co-Founder of KRISSTALK forums, an owner’s support group and all things KRISS Vector related. Nick found his passion through competitive shooting while living in NY. He participates in USPSA and 3Gun. He loves all things that shoots and flashlights. Really really bright flashlights.

Any questions please email him at


  • andrey kireev

    Mine tosses sparks out once in a while…

  • Griz

    Left handed operators, operating in bearded operations would have the smell of burning hair stuck in their nose.

    • claymore

      Or the smell of burnt “Nose hair” in the air.

  • iksnilol

    Helps reduce recoil by venting through the ejection port xD

  • dshield55

    The Russians have been experimenting with hybrid 12 Gauge and M2 Carl Gustaf recoiless rifles.

    • andrey kireev

      Why Karl Gustav, when they have an SPG-9 ?

      • dshield55

        Nyet! Goose is fine.

  • Excess back pressure causing the piston to unlock the rifle earlier perhaps?

    I am not sure if the Vepr’s have adjustable gas port settings, but if it did it would be an easy fix.

    • andrey kireev

      It’s a self regulating system.

  • joshv06

    Kind of normal. Happens every now and then on my Benelli M4. It’s more noticable around dusk, night time or indoors.

    • Jonathan Ferguson

      Exactly; not all of muzzle flash is unburnt powder; much of it is ignition of flammable gases. These also emerge from the ejection port, and you can even see it with 5.56 weapons in low light, despite the lower case capacity.

      • joshv06

        The key is to have a long gas system. So the case can stay in the chamber longer burning powder. Since 12GA pressure drops quickly, this isn’t possible. This problem is seen in 300BO pistol length gas systems. This is why I run a middy XD.

  • ostiariusalpha

    That fireball is super obviously coming out of the ejecting hulls. You can see it clearly on the third shot when the hull is ejected & pointed back, but a bit of fireball comes out of it. Seems to be cycling a bit too quickly for the burn rate of the powder that’s being used, which wouldn’t be a problem for a manually loading shotty.

  • Major Tom

    Who needs taclights when you can simply blind the enemy (and yourself) with muzzle flash and fireballs?

  • Zang Kang King

    Take the brake off and film, use the same ammo. Then you will have an answer. And the answer will be?? Shotgun cartridges are extremely low pressure compared to centerfire rifle or pistol. In the region of 9000psi vs 30,00-60,000 psi for a centerfire. Not to mention the bore size and time pressure curve. These things happen on guns with added back pressure. This is photo of a 300blk with a can on it, with the same event happening.

  • DIR911911 .

    “It looks cool though.” . . . famous last words

  • Zang Kang King


  • wedelj1231

    I’m glad people haven’t forgotten about that. Not even being sarcastic