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What's the ammo cost for an event like that? I can remember spending $30 on powder and caps for my Civil War guns back in the 90s. I can't imagine full auto non reloadable blanks or even ammo for the Garands. I did have a Spencer rifle that I made to shoot 45LC blanks. It wasn't terrible back then. I reused the Smith carbine rubber cases.
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Now a days, 7.92x57mm blanks are running about a buck a pop. Looking at feeding an MG42, which runs between 1200 to 1500 rpm (about 15 to 20 rounds per SECOND)...you'll soon discover that live MG's are a rich man's toy.
The alternative? Propane and oxygen. A sparkplug is installed where the chamber would be. A coil and gas solenoids (and circuit board) replace the bolt, rails, etc... Gas lines and electric run out the back and are plumbed into gas regulators and a battery.
All the sound of a machinegun... Uses about $5 worth of gas all weekend long!
Attached FileMy '42... Made in 1944 in the Gustloff arsenal in 1944.