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How does an open bolt SMG with a fixed firing pin prevent primer

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How does an open bolt SMG with a fixed firing pin prevent primer strikes if a round jams with the bolt out of battery?
>>
>>34847200

it doesn't

this is a problem inherent with open bolt SMGs, but is tolerated since they're so cheap to make
>>
The firing pin isn't in position directly over the primer yet.
>>
Normally it is not lined up with the firing pin. Only when the bullet is in the chamber is the bullet lined up for the firing pin.
>>
It doesn't. But on a straight blowback design especially on an open bolt gun it's incredibly uncommon for a round to get stuck in the chamber except for a failure of the round itself.
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