this 9mm caliber Allied submachine-gun was born of desperation and urgent need and its production was well over 50,000 units by 1945. though somewhat odd in appearance, a bit heavy, bulky and somwhat top-heavy, it was VERY rugged and reliable (except for a somewhat finicky magazine.) it took all sorts of rough conditions and stoppages were remarkably rare... in fact, the troops that were issued it LOVED it and even when more modern type weapons were available, many flat refused to part with it. in fact, the weapons soldiered on until the 1960s, when they were turned over to reserve units. it fought and killed the enemy in all sorts of conditons... rain, mud, dust, salt water and jungle, a valuable weapon that surely deserves more worldwide recognition.
(big hint...the men that used it the most talk a bit funny---to us Americans and Europeans, anyway. hehehehe...

Length 32 inchs.
Weight unloaded, 9lb, 5oz.
Caliber, 9mm.
Magazine, 33 round detachable box.
Cyclic rate, 700 rpm.
Muzzle velocity, 1250 fps.
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good luck on the guesses...
Beowolff