I agree that Karl is like that irl, but in the video he seems to have boiled himself down to a caricature just for the bit. This video actually shows some self-awareness from his part.
Problem is that he returns to his annoying real self when he's back in front of his keyboard.
Well, there's the M80A1 round, which is the Big Boy™ version of M855A1.
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I have a different take, though. We should increase chamber pressures if the Sig case design is that good. Do some fancy EDM shit on barrels and create relief cuts that don't disturb the rifling to get sharp pressure drop close to the uncorking of the bullet at the muzzle. Short cans at the end. Fuck it, we 5.56 Magnum now.