I believe the MP40 is an open bolt gun. If the sear doesn't catch it's going to dump the whole magazine. Rental guns see a lot of use, it was either worn or in need of a cleaning. There's a good reason open bolts are not used very often today.
And yes, if a gun goes full auto, keep your head down and hang onto the thing. It will run out pretty quick but you need to keep on target.
And yes, if a gun goes full auto, keep your head down and hang onto the thing. It will run out pretty quick but you need to keep on target.


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