>The Blish lock is a breech locking mechanism designed by John Bell Blish based upon his assumption that under extreme pressures, certain dissimila...

>The Blish lock is a breech locking mechanism designed by John Bell Blish based upon his assumption that under extreme pressures, certain dissimilar metals would resist movement with a force greater than friction laws would predict.
>In modern engineering terminology, it is an extreme manifestation of what is now called static friction, or stiction.
>His locking mechanism was used first in the Thompson submachine gun.
>Nowadays it is discredited as a useful firearm operating principle, due to its almost nonexistent effects on the operation and functioning of a firearm;
>because of that, firearms which theoretically employed it operate not by the supposed Blish lock principle,
>but, in fact, by blowback operation.

so in practice it's simple blowback just with a 2 pound hunk of machined bronze in it causing it to cost twice as much
What are some other discredited firearms mechanics?

  1. 2 weeks ago
    Anonymous

    >What are some other discredited firearms mechanics?
    short rifles and shotguns being mo’ dangerous

    • 2 weeks ago
      Anonymous

      Aw lawd theenk of dem keeeiids!!

  2. 2 weeks ago
    Burt

    "Anular delay" is also nonsense. The principle is that by cutting a larger diameter at the front of the chamber, fired brass would expand into it causing the brass to keep the chamber sealed until pressure lowers to a safe level whereby the brass will be compressed by the smaller, normal diameter rear section of the chamber and be extracted by the remaining pressure and extractor. The Detonics Pocket 9 here supposedly uses this mechanism. It stings like a heckin son of a gun because the anus doesn't work, it just functions like a blowback in 9mm instead of .380.

    I'm also reminded of the MAB P15/PA15 which has a rotating barrel that supposedly locks the action but actually doesn't because it starts un-rotating immediately with no dwell time like a true rotating barrel locked breech such as the Beretta PX4 or Boberg XR9. The MAB consequently is also extremely brisk recoiling and feels like a direct blowback 9mm, despite the very heavy all-steel construction.

    • 2 weeks ago
      Anonymous

      It strikes me that it's going to be taking some of the edge off straight blowback, but the amount is going to be very dependent on the specific ammo you're using. The sort of thing that might work okay for a military, but a utter shitshow on the Johnny Retard market.
      Unless of course the ring is literally right at the front of the chamber, in which case the brass has probably fucking moved past it by the time it's expanded.

      • 2 weeks ago
        Burt

        It's hard to get a pic in there but the sphincter is at the very forward edge of the case, like the first 1-2mm. I can't imagine it doing anything in that spot at least, the bullet is seated much farther than that into the brass. It wouldn't experience any pressure at all until the bullet fully leaves the case.

        Burt, does the annular delay cause a ring-shaped bulge in the ejected brass? If it does, it therefore must be absorbing some energy, no?

        Shoot it's been a long time since I shot that thing and I may not even have looked at the brass if I didn't know about the chamber gimmick before hand. I dunno, but the memory of hand sting is strong lol

        • 2 weeks ago
          Anonymous

          Yeah that's just fucking retarded. Put two or three of them evenly spaced from the middle of the chamber wall and you might be going somewhere.

        • 2 weeks ago
          Anonymous

          >It wouldn't experience any pressure at all until the bullet fully leaves the case.
          the case ballons against the chamber wall under pressure. unless there is a perfect fit, which there isn't, the case will form a lip. I'm pretty sure the force needed to swage the lip back is negligible though.

          • 2 weeks ago
            Anonymous

            The problem is it's started moving slightly backwards before the pressure's even peaked. There's nothing holding it closed but a spring.

    • 2 weeks ago
      Anonymous

      Burt, does the annular delay cause a ring-shaped bulge in the ejected brass? If it does, it therefore must be absorbing some energy, no?

      • 2 weeks ago
        Anonymous

        >cause a ring-shaped bulge in the ejected brass
        Shouldn't the brass be reformed as it passes through the rest of the (normally specced) chamber?

    • 2 weeks ago
      Anonymous

      Seecamps have a divot dremeled into the side of the chamber for supposedly the same reason. Another reason I hate those things.

    • 2 weeks ago
      Anonymous

      Get it rechambered for .960

    • 2 weeks ago
      Anonymous

      annulus, not anus. If the anus doesn't work your gun needs a colostomy bag.

    • 2 weeks ago
      Anonymous

      I don't really know shit about Detonics, but I'm salty at them for never making pic related.

      • 2 weeks ago
        Burt

        44 magnum break top lol ya rite, they must have found out pretty quick that's spooky. I guess the .357 didn't pan out either

        • 2 weeks ago
          Anonymous

          Google patent number 4539771, they had an idea to make a sort of self-correcting locking latch. Kinda neat idea, and given the weight of that thing I think it probably really would have held up to factory .44 and even some Hispanicy .357. However, reloaded .44 beyond SAAMI spec, probably not, especially over a lifetime. I certainly would have liked to have seen it, the idea for caliber conversion is neato.

    • 2 weeks ago
      Anonymous
  3. 2 weeks ago
    Anonymous

    1v1 me in wildy blish

    • 2 weeks ago
      Anonymous

      >blish locks you
      nothing personnel, kid

  4. 2 weeks ago
    BigC

    >2 pound
    are you fucking retarded?
    that's like 1-2oz of metal

    • 2 weeks ago
      Anonymous

      Dog rapist

      • 2 weeks ago
        BigC

        proof?

        • 2 weeks ago
          Anonymous

          As a furgay, tripmoron and general homosexual you are presumed to be a dog rapist and the burden is on you to rebutt the presumption.

          • 2 weeks ago
            BigC

            >nothing
            yep, exactly lol

            I must admit I am a fan of this BigC dog fucker PrepHole lore.
            For some reason it never fails to bring a smile to my face.

            >as a redditor i am so amuse by this lore!
            go back and reply again

            • 2 weeks ago
              Anonymous

              >go back
              Lol no thanks people get upset on reddit when I make fun of retarded autists who can't keep their hands off those stupid sexy border collies.

        • 2 weeks ago
          Anonymous

          I saw you fucking a dog against its will

          • 2 weeks ago
            BigC

            no you didn't?
            seethe and reply again

            • 2 weeks ago
              Anonymous

              Yeah, I did
              Just because you didn't see me doesn't mean I didn't see you, you took that little dog, probably not more than 6 months old out into the sands and raped it.
              I picked you up on thermals before moving in closer, saw what you did to that thing you sick fuck, I should have shot you there and then but retarded me didn't bring ammo.
              You raped that dog, then you killed it to hide your shame or maybe you just like that, I don't know but you are one fucked up dude and really should seek help.
              If I ever catch you out there again I will shoot you and I will hide your body. You won't be found and you won't ever harm another animal again.

              • 2 weeks ago
                Anonymous

                We tracked him easy

      • 2 weeks ago
        Anonymous

        I must admit I am a fan of this BigC dog fucker PrepHole lore.
        For some reason it never fails to bring a smile to my face.

        • 2 weeks ago
          Anonymous

          You do know bigC, mr crummy, mr crummy paws, and etc are all just garand thumb shit posting and baiting new fags right?

          • 2 weeks ago
            Anonymous

            >Baiting newfags
            Brohim I am fucking ancient.
            I come from a time before, when "zoomers" weren't even a thing.
            I'm like PrepHole's grey-bearded wandering wizard uncle.
            I drift away from the retarded finger pointing shit throwing baboon pit for years at a time, then return for a few months when I have some questions only an anon autist could answer, only to find my old acquaintances are gone or in actual prison, replaced by new retards.
            This dogfucker is not known to me.
            Two years is a long time to be gone, but in the past three months I've seen many references to his amatory canine nature, too many to count.
            Dogfucker he is, and dogfucker he shall be.

            • 2 weeks ago
              Anonymous

              you're not alone o7

          • 2 weeks ago
            Anonymous

            I accept this as my new reality anytime I see BigC pop up from here on. Btw mr crummy, you shoulda put the D in the Deer, not the Dog ¯_(ツ)_/¯

  5. 2 weeks ago
    Anonymous

    Explain to me why the blish lock doesn’t make the thompson roller delayed. Yeah the friction thing is bullshit but it still has to push the lock aside before the action can open. isn’t this mechanically very similar to the roller delays that give the MP5 such a good reputation?

    • 2 weeks ago
      Anonymous

      >Explain to me why the blish lock doesn’t make the thompson roller delayed
      It doesn't have rollers

      • 2 weeks ago
        Anonymous

        No, but it has a wedge that has to move to the side before the bolt can move back, thus delaying blowback

        • 2 weeks ago
          Anonymous

          That would make it wedge delayed.

    • 2 weeks ago
      Anonymous

      Roller delayed bolt is not friction bolt. Its inertia bolt like straight blow back. Only it uses mechanical link via rollers to accelerate bolt so it may reduce bolt weight. because bolt impulse = M*V

    • 2 weeks ago
      Anonymous

      The blish lock actually slowed down the rate of fire on the M1928's compared tot he later M1/M1A1's - which had a simplified and heavier bolt (which usually results in a lower ROF)

    • 2 weeks ago
      Anonymous

      You don't know what roller delayed blowback is.

  6. 2 weeks ago
    BigC

    [...]

    cry more?

    • 2 weeks ago
      Anonymous

      moron ass bitch fuck bitch ass moron

      • 2 weeks ago
        BigC

        >he's losing his mind
        kek

        • 2 weeks ago
          Anonymous

          Spokane like a true bitch ass moron

          • 2 weeks ago
            BigC

            absolutely seething

            • 2 weeks ago
              Anonymous

              This bro malding so hard he'll give me endless (you)s but not get a single one out of me, go fuck your dog some more
              L M A O
              M
              A
              O

              • 2 weeks ago
                BigC

                reply again retard, i was too busy eating MREs and having a fire in the snow

              • 2 weeks ago
                Anonymous

                More like too busy fucking your dog

          • 2 weeks ago
            Anonymous

            hey now leave po'dunk spokane out of it

  7. 2 weeks ago
    Anonymous

    Why were early SMGs so shit?
    When I first read the term "telescopic bolt", I thought it was something fanciful, like a segmented bolt in which the parts concentrically intersected one another during operation, not that it was referring to every slide equipped pistol ever made.

    • 2 weeks ago
      Anonymous

      >When I first read the term "telescopic bolt", I thought it was something fanciful, like a segmented bolt
      I thought the exact same thing when I first heard of "telescoping ammunition", imagine my disappointment when it's literally just "there's propellent next to the projectile not just behind it"

  8. 2 weeks ago
    BigC

    Ya know, one thing I've noticed about this tripfag moron is he absolutely relies upon his self image of everyone SEETHING over him. He can't fathom that people just kinda think he's pathetic and/or funny.
    Anyways I'll collect my extremely prompt (you) from him because he spams that F5 key.

  9. 2 weeks ago
    Anonymous
    • 2 weeks ago
      Anonymous

      By most accounts it does work, but since you can only buy a semi-auto version it doesn't matter.

      • 2 weeks ago
        Anonymous

        It's my understanding that the low bore axis and heavy weight have a lot more to do with the recoil characteristics than the weird funky action

        • 2 weeks ago
          Anonymous

          If that were true it would shoot better in semi.

      • 2 weeks ago
        Anonymous

        You can't defeat physics, bro. Transfer of momentum is always equal and opposite. So the recoil force is always opposite the direction of the bullet (backward).

  10. 2 weeks ago
    Anonymous

    [...]

    You know anon, I could have gone my whole life without seeing that and been perfectly happy

    • 2 weeks ago
      Anonymous

      A visual aid helps to elucidate talking points.

    • 2 weeks ago
      Anonymous

      It's your own fault for clicking on a file titled "Bowel_Evisceration.jpg"

  11. 2 weeks ago
    Anonymous

    So did he not like test the mechanism to make sure it helped first

    • 2 weeks ago
      Anonymous

      It's not like he had some sort of high speed camera or anything

    • 2 weeks ago
      Anonymous

      Testing would had been as simple as making the lock out of the same material. Luckily for him he got the first-mover advantage into the American submachine gun market so that fact that he was making shit up and couldn't be bothered to do a basic sanity check didn't hurt him much. He likely came up with the geometry of his lock by randomly adjusting dimensions until it worked too. It could even had been a marketing stunt, in that he knew it didn't do anything, but pretended it did regardless.

  12. 2 weeks ago
    Anonymous

    You're like terminally online Biggay you are obsessed with the opinions of people here lmao stop trying to fool yourself. You fucking will come back to threads days later just to check if someone mentioned you.

    • 2 weeks ago
      BigC

      didn't read bro reply again

      • 2 weeks ago
        Anonymous

        hey didn't read the rest of this thread but you kind of come off as a moron lol just a heads up

        • 2 weeks ago
          BigC

          ok?
          reply again i don't care

          More like too busy fucking your dog

          yeah i fucked ur mom

          • 2 weeks ago
            Anonymous

            idk bro my mom may be a bitch but she's not a dog, big press X on that one

  13. 2 weeks ago
    Anonymous

    Lmao I bet he just replied to me too like an obsessed retard, have him filtered.

    • 2 weeks ago
      BigC

      >i have him filtered
      >but imma keep replying to him
      lol this is gold, go again

  14. 2 weeks ago
    Anonymous

    [...]

    How was that bowel eviserated? A hernia?

    • 2 weeks ago
      Anonymous

      Presumably, it was a colostomy complication.
      I have no idea why it looks like his abdominal wall has no structure.

  15. 2 weeks ago
    Anonymous

    It wasn't simple blowback, it was angular delayed blowback.
    The H bar acted on two cuts in the receiver to delay the opening of the action until the lugs cleared the angular cut cam track.
    It just wasn't a locked breech. It was closer to the HK roller delay.

  16. 2 weeks ago
    Anonymous

    Lmao this morons really spent 8-12 hours replying to people obsessively how pathetic

    • 2 weeks ago
      Anonymous

      Obsession with public image and general narcissism are common traits in homosexuals

    • 2 weeks ago
      BigC

      idk bro my mom may be a bitch but she's not a dog, big press X on that one

      Obsession with public image and general narcissism are common traits in homosexuals

      Yeah, I did
      Just because you didn't see me doesn't mean I didn't see you, you took that little dog, probably not more than 6 months old out into the sands and raped it.
      I picked you up on thermals before moving in closer, saw what you did to that thing you sick fuck, I should have shot you there and then but retarded me didn't bring ammo.
      You raped that dog, then you killed it to hide your shame or maybe you just like that, I don't know but you are one fucked up dude and really should seek help.
      If I ever catch you out there again I will shoot you and I will hide your body. You won't be found and you won't ever harm another animal again.

      https://i.imgur.com/52lJZk3.jpg

      >Baiting newfags
      Brohim I am fucking ancient.
      I come from a time before, when "zoomers" weren't even a thing.
      I'm like PrepHole's grey-bearded wandering wizard uncle.
      I drift away from the retarded finger pointing shit throwing baboon pit for years at a time, then return for a few months when I have some questions only an anon autist could answer, only to find my old acquaintances are gone or in actual prison, replaced by new retards.
      This dogfucker is not known to me.
      Two years is a long time to be gone, but in the past three months I've seen many references to his amatory canine nature, too many to count.
      Dogfucker he is, and dogfucker he shall be.

      Reply again

  17. 2 weeks ago
    Anonymous

    I wouldn't call blish lock simple blowback, it did have a delaying factor and this was proven by the M1's (simple blowbacks) had a much higher firerate than the M1928 or other earlier variants of the thompson which had the blish lock.
    It was delayed but just not how blish thought it would.

    • 2 weeks ago
      Anonymous

      Pre-Blish 1919 Thompson was ~1200rpm
      range was from 1100-1500rpm

      Blish 1921 Thompson -800rpm

      Blish M1928 ~700-800rpm
      The 1928 series will introduce a new/heavier duty actuator than the 1921....eventually - early 1928's were 1921 overstamps with very minor changes

      Blish M1928 Navy - 600rpm
      It's important to note here that they achieved this ROF with the new actuator design and specifically with a much heavier recoil spring

      Blish 1928A1 ~700rpm
      Most produced variant of the Thompson

      Non-Blish guns - straight blowback
      The M1 and M1A1 had vastly simplified bolts, that were heavier than all earlier variants. Both variants utilized a heavier spring set which on paper was supposed to mimic the 1928 Navy and achieve 600rpm

      Post-Blish M1 Thompson - 600-700rpm
      3rd most produced Thompson variant
      Simplified bolt with free float firing pin
      Due to the heavier spring wearing out the M1's rate of fire could jump to ~850rpm approaching 900

      Non Blish M1A1 - 600-700rpm 2nd most produced thompson
      The final thompson did away with the free floating firing pin for a fixed one and had a simplified hammer, largely resolving the ROF jump with the M1.

      To concur:
      The blish is responsible for lowering the rate of fire and provides some level of retardation to the 1921, 1928, and 1928A1's with their light bolt design.
      Note how the principle difference between the 1919 Thompson pushing over ~1200rpm vs the 1921's 800rpm is the presence of the Blish lock in the latter.

      The Blish lock allowed for a lighter operating mass. The M1928A1 is only nominally heavier than the M1A1 yet the M1928A1 has:
      >Vastly more complex and heavier folding adjustable sight
      >Barrel cooling fins which add mass to the barrel
      >A big ass cutts compensator
      >Foregrip handguard
      >Drum magazine

      The feature rich M1928A1 is only 8oz heavier than the simplified (in both reciever and bolt) M1A1 which has none of those features, and arguably has a pure fucking dogshit sight that makes the Greasegun blush.

      • 2 weeks ago
        Anonymous

        Quality post thanks I learned things today.

      • 2 weeks ago
        Anonymous

        >The blish [...] provides some level of retardation
        Hehehehehehe

  18. 2 weeks ago
    Anonymous

    Lol the bitch is back for more

    • 2 weeks ago
      BigC

      And here you are, ready to supply my (You)s

  19. 2 weeks ago
    Anonymous

    Hes SEETHING and been monitoring this thread for what like almost 20 hours now? What a loser

    • 2 weeks ago
      BigC

      >projecting on me

      • 2 weeks ago
        Anonymous

        sometimes i wonder if bigc is just a massive shitpost or a weird fusion of whoever you really are subconsciously coming out due to internet anonymity
        >how many shitposts does it take to satiate the namefags..the world will never know

        • 2 weeks ago
          BigC

          >he's still going
          lol keep it up

  20. 2 weeks ago
    Anonymous

    Congratulations on ruining a good thread. I hope both of you gays die horribly.

    • 2 weeks ago
      BigC

      i didn't do anything, my first post was perfectly on topic

      >2 pound
      are you fucking retarded?
      that's like 1-2oz of metal

      this other dude just can't control himself

      • 2 weeks ago
        Anonymous

        >PrepHole is one person
        I'm almost certain none of these are the same person.
        Lurk moar newfag

        • 2 weeks ago
          BigC

          >im almost certain that
          i don't care lol
          reply again, also, i've been here WAY longer than you, feel free to go back at any time
          the fact you're calling me a newfag just shows how new you are

      • 2 weeks ago
        Anonymous

        This would have been a perfectly normal thread if you weren't an attention seeking tripfag

  21. 2 weeks ago
    Anonymous

    OP here
    I am a gay, but even I know enough to tell all you derailing retards to go to hell
    especially the tripmoron

    • 2 weeks ago
      BigC

      This would have been a perfectly normal thread if you weren't an attention seeking tripfag

      There you go, ruining the thread again
      You could just not do this, you know that right?

  22. 2 weeks ago
    Anonymous

    >im going to show everyone how im not the one fucking this thread up by responding to every post

    • 2 weeks ago
      BigC

      there he is, doing it again!

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