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A short but GREAT video of an M4 firing and then the M203 training grenade. Did I mention this is a model! Yes thats right its not actually firing bullets, it's called a blowback replica. I don't know why anyone would want a replica that costs almost as much as the real thing, but it's pretty dam good if you ask me.
The Japanese market for cartridge driven blowback replicas is pretty big, due to their draconian firearms laws.
They sell a ton of full metal weapons that take re-useable brass and spew it very realistically.
Cool, but I could just buy the M4gery, Thompson etc etc for the same outlay :)
for film making