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View Diary: It's Happened: Paramilitary Police vs Civilians in Anaheim (272 comments)

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  •  Can't chamber a 40mm grenade in a 37mm gun (1+ / 0-)
    Recommended by:
    Robobagpiper

    Rifling aside, it's obvious that 37mm was chosen for the civilian variant in order to ensure it could not load military rounds.

    •  It's not obvious that the 37mm was chosen at all. (1+ / 0-)
      Recommended by:
      KenBee

      See my link above to an email from the Richmond, CA Police Department containing bid info for a Penn Arms 40mm rifled MGL.

      The Penn Arms device looks remarkably like what is pictured in the diary above.

      Until someone provides some sort of concrete evidence that -- what I've found to the contrary -- police departments are only using smooth-bore 37mm variants, I see no reason to assume out of hand that they are not using 40mm rifled MGLs.

    •  How deep is the rifling? (2+ / 0-)
      Recommended by:
      Quicklund, PavePusher

      Wouldn't a 1.5mm deep groove account for the difference in cited caliber?

      But you're right - slightly smaller can be chambered in slightly bigger, but not vice-versa.

      Non enim propter gloriam, diuicias aut honores pugnamus set propter libertatem solummodo quam Nemo bonus nisi simul cum vita amittit. -Declaration of Arbroath

      by Robobagpiper on Mon Jul 30, 2012 at 10:58:36 AM PDT

      [ Parent ]

      •  Soviet 82mm mortars (1+ / 0-)
        Recommended by:
        PavePusher

        I am pretty sure a 3mm difference on a base of 40mm is going to preclude chambering  any 40mm round in the civilian version.

        I am no gunsmith but I remember back from the Cold War days that the Soviets chose 82mm for their mortars because the NATO standard was 81mm. The Red Army could use captured NATO mortar bombs in their 82mm tubes, but NATO could not return the trick on them.

        Similar caliber differences existed on the 122mm / 120mm heavy mortars and several other weapon systems IIRC.

        So if a 1mm difference is enough to keep an 82mm bomb out of an 81mm mortar tube, I am very confident a 40mm grenade  could not be chambered in a 37mm launcher.

        •  Oh, I'm not doubting the inability to chamber (2+ / 0-)
          Recommended by:
          Quicklund, PavePusher

          I'm wondering if 37mm would be the diameter of the tube before it's rifled.

          Non enim propter gloriam, diuicias aut honores pugnamus set propter libertatem solummodo quam Nemo bonus nisi simul cum vita amittit. -Declaration of Arbroath

          by Robobagpiper on Mon Jul 30, 2012 at 12:07:33 PM PDT

          [ Parent ]

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