Assertion: submachine gun's fire | /r/CapableOf | wear the magazine catch
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Source sentences:
text: Firing the Sten by grasping the magazine with the supporting hand tended to wear the magazine catch, altering the angle of feed and causing a failure to feed – the correct method of holding the weapon was as with a rifle, the left hand cradling the fore piece, as per the picture of Winston Churchill firing one below.