I agree with the poster who said 1.5hrs. If you have access to a junkyard, especially an automotive junkyard and the basic tools any shop would/should have you could be turning out single shots in under an hour. Rotating breech models in about two hours and full auto grease guns in a day allowing time for making the high capacity magazines.
Don't ask me how I know and +1 for the guy who said get the Armys "Improvised munitions handbook" for some nifty ideas and usefull reference tables.
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