we'll start with an EASY one...
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this weapon, a submachine-gun, was made by the Harrington & Richardson Arms Company in Worcester, Mass.
Caliber: .45 ACP
Length: 35.75 in.
Weight: 6lb or so.
Magazine: 12 or 20 round detachable box.
Cyclic rate: 550rpm.
Muzzle velocity: 920fps or so.
production run: several thousand, as many as 100,000 or so of this model and its brother model in total.
Ingenious design that fired from a closed bolt, though 'that' was not such a good feature of a fully automatic weapon due to heat buildup and potential round cook-off. many of the production went to USA forces (though not well recieved) and some went to Russia. this weapon was VERY prone to jamming from dirt/mud/dust and suffered a design weakness in the magazine. though it worked well for police and security forces where good care and clean conditions existed... it should never have been issued for general combat use. and it didn't take the US too long to figure that out.
Name this weapon:
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come on, some of you gun nuts....

Beowolff