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.5 bsa

  1. C

    .5 BSA Observers Gun

    Hello All, I am trying to figure out what the .5 BSA Observers Gun cartridge was. I understand it was the Model 1924 BSA machinegun, but what cartridge did it use? I found a little snippet of information that said it was similar to the .50 Vickers, but different (whatever that means). Can...
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