Originally Posted by Endymion
IIRC the Smokey's is spring-operated, and even more uncommon than the VFC. To my knowledge, there is no gas blowback model of the .50 Barrett yet - gas-operated yes. Blowback, no.
EDIT: The man who knows beat me to it.
there was a company called killer studio who made a small production run of blowback M82 kit but the quality was not even close to the garage gun works(smokey's) but at least it's an AEG based out of a TM G3 SG1