Tell me about ported barrels?

Tell me about ported barrels /k/

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  1. 2 months ago
    Anonymous

    Stupid questions:
    Could you port a large calibre wildcat rifle (fudware) and drop it to subsonic with hand loads? Huge bullet, very slow, ported barrel. Thud. Why? Because it would be cheap.

    How is the ballistic performance staked? Port early? Equidistant? Wave form? Harmonic?

    Does what the barrel ports into actually matter? It's not a suppressor, could you port into a hollow stock?

    Could you screw a wipe onto the end of a ported barrel?

    Why don't we see more of the Russian pattern ported pistols? The ones which predate the piston cartridge. I think the Chinese have some.

    Can you port a smooth bore shotgun to fire slugs?

    • 2 months ago
      Anonymous

      There's no use for a ported barrel if you plan on shooting subsonic reloads, I shot subsonic 300gr 44 mag and subsonic 500gr 45-70 out of leverguns no biggie, same boes for .375 hh... It the corresponding suppressor (.44 and .45 suppressors are stupidly expensive when rifle rated)

      Oh and with port d barrel you get more barrel fouling, usually not an issue with jacketed bullets but if you plan on slinging subsonic large calibers it will be mostly lead/ molycoated stuff.

      • 2 months ago
        Anonymous

        Interesting, thank you

    • 2 months ago
      Anonymous

      Porting a barrel to bleed velocity is very different from porting a barrel to replace a compensator.

      The former requires an unusual sort of suppressor which covers much of the barrel rather than attaching to the end of it. I don't think enough companies have experimented with the port-overbarrel suppressor concept for there to be good data on things like accuracy and harmonics. This should be obvious, but if the suppressor doesn't cover the ports, the end result will be a very loud gun.

      Compensation ports, on the other hand, are generally as far towards the muzzle as is practical. They work best with high-pressure and high-velocity rounds.

      You can add compensation ports to a shotgun to reduce muzzle rise without affecting accuracy as in picrel, but there are no over-barrel shotgun suppressors, so the other style wouldn't work.

      • 2 months ago
        Anonymous

        I don't see why the shroud needs to cover the whole barrel. My thinking is that you could use a square box shroud to replace the lower grip. With a bled system it must surely be a volume game.

        My gut feeling is if you drilled ports in the lower side of the barrel in a Fibonacci sequence you would get a reasonably efficient port placement. Then just put Huge rectangular tube over the whole thing in place of furniture. The threaded wipe would effectively seal the gap between the barrel and the shroud.

        40 minute job, quieter then shooting subsonic because you've fully contained the gas.

        • 2 months ago
          Anonymous

          It's not a shroud, it's a supressor. The suppressor needs to cover the part of the barrel where the ports are. That's how the gun you posted works, did you not realize that? That's also how the Russian integrally silenced ported pistols work. Before bringing in Mr. Fibonacci, you might want to make sure you understand some more fundamental parts of this mechanism.

          • 2 months ago
            Anonymous

            what are you on about? I feel like you have a fundamental misunderstanding of what the MP5SD is or what a suppressor is
            >I don't see why the shroud needs to cover the whole barrel.
            it's not a shroud, it's a suppressor. if you don't cover up the ports in the barrel that are venting gas into the atmosphere then they will vent the gas into the atmosphere, producing light and noise. I really don't understand how this needs to be explained to you. what happens at the end of the barrel when the bullet comes out and releases all of the gases that were driving it? you get a flash and a bang. same thing with the holes in the side of the barrel
            >My gut feeling is if you drilled ports in the lower side of the barrel in a Fibonacci sequence you would get a reasonably efficient port placement. Then just put Huge rectangular tube over the whole thing in place of furniture. The threaded wipe would effectively seal the gap between the barrel and the shroud.
            you basically just described how the MP5SD already works except with a box shaped suppressor, no handguard, and wipes. I don't see what you gain by making the suppressor a box shape.
            >fully contain the gas
            you can't though, it has to escape eventually or else you would just fill up whatever chamber you're storing the gas in and the suppressor wouldn't work after a couple shots. suppressors slow the gas down, they don't trap it.

            Actually it's a silencer because it makes the gun silent, you educated people and your word knowing.

        • 2 months ago
          Anonymous

          what are you on about? I feel like you have a fundamental misunderstanding of what the MP5SD is or what a suppressor is
          >I don't see why the shroud needs to cover the whole barrel.
          it's not a shroud, it's a suppressor. if you don't cover up the ports in the barrel that are venting gas into the atmosphere then they will vent the gas into the atmosphere, producing light and noise. I really don't understand how this needs to be explained to you. what happens at the end of the barrel when the bullet comes out and releases all of the gases that were driving it? you get a flash and a bang. same thing with the holes in the side of the barrel
          >My gut feeling is if you drilled ports in the lower side of the barrel in a Fibonacci sequence you would get a reasonably efficient port placement. Then just put Huge rectangular tube over the whole thing in place of furniture. The threaded wipe would effectively seal the gap between the barrel and the shroud.
          you basically just described how the MP5SD already works except with a box shaped suppressor, no handguard, and wipes. I don't see what you gain by making the suppressor a box shape.
          >fully contain the gas
          you can't though, it has to escape eventually or else you would just fill up whatever chamber you're storing the gas in and the suppressor wouldn't work after a couple shots. suppressors slow the gas down, they don't trap it.

      • 2 months ago
        Anonymous

        >there are no over-barrel shotgun suppressors
        They exist but they're almost primarily a British thing. Meant for quiet hunting and apparently really cheap over there.

        • 2 months ago
          Anonymous

          Interesting, that's cool

          https://i.imgur.com/PC1bOp6.png

          Do you not know how an MPSD works

          Hey, cut him some slack, neither apparently does the OP

        • 2 months ago
          Anonymous

          I was just about to say this. People don't realise how much local laws shape the market - US can designs are dictated by durability and extracting maximum cash in a single transaction, with a side order of instagram bragging rights and audiophile tier snake oil.

        • 2 months ago
          Anonymous

          This is exactly my plan.
          You get a cheap as shit rifle or shotgun, port the barrel with a hand drill, weld a shroud over it and rely on disposable wipes. Probably far lighter than a suppressor if you could even get one, no fricking around with alignment, the bullet just goes through the wipe wherever it feels like.

          I had a replica delisle made and the sbr stamp got approved yesterday but the suppressor stamp hasn't been approved. It sucks.

          I can see why they would be cagey about giving a stamp for a weapon specifically designed to kill nazi sentries.

          I was just about to say this. People don't realise how much local laws shape the market - US can designs are dictated by durability and extracting maximum cash in a single transaction, with a side order of instagram bragging rights and audiophile tier snake oil.

          Americans are cucks. I've got a shed, a mig welder and Jesus and nobody comes to here trying to bother me.

          I'm going to start by porting a smooth bore shotgun, possibly a 410 break action to see if it's actually useful and work out the best way to bleed gas.

          Then based on the outcome I might get a 45-70 barrel (as the other anon said it stands out) and build my own falling block action (because it's an easy action to build if you overbuild it).

          Historically these weapons were used at point blank range, but given the ballistic characteristics of 45-70 I see no reason you wouldn't put an artillery sight on it like the antique ones, a bipod and set it up for huge tower introduction. You could just plink at something big until you hit it

          • 2 months ago
            Anonymous

            Word of warning you do not want to be shooting anything other than a jacketed bullet through a wipe, that includes sabots.

  2. 2 months ago
    Anonymous

    why does he wear the mask?

  3. 2 months ago
    Anonymous

    It would be very painful

    • 2 months ago
      Anonymous

      I had a replica delisle made and the sbr stamp got approved yesterday but the suppressor stamp hasn't been approved. It sucks.

      • 2 months ago
        Anonymous

        no you didn't

  4. 2 months ago
    Anonymous

    they're a waste tbh
    you're better off using normal barrels and actual subsonic ammo instead, because atleast then you're getting a heavier weight bullet for the same (low) velocity

  5. 2 months ago
    Anonymous

    They got holes in them.

  6. 2 months ago
    Anonymous

    >Tell me about ported barrels /k/
    >picrel is MP5SD
    Do you mean fluted chambers?

    • 2 months ago
      Anonymous

      Nah he means the holes in the barrel just past the chamber to bleed off the gas pressure to make the supersonic round subsonic.

      • 2 months ago
        Anonymous

        https://i.imgur.com/PC1bOp6.png

        Do you not know how an MPSD works

        My bad guys, idk why I mistook fluted chambers for fluted/ported barrels

    • 2 months ago
      Anonymous

      Do you not know how an MPSD works

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