I don't think gas consumption has to be as much of an issue as everyone makes it.
The only real condition I can think of is that the gun would come out as a comprimise between an AEG and a Classic style rifle...
Lighter bolt, more 'GBB' style mechanism would mean minimal kick, but the payoff would be a simpler mechanism and better gas efficiency.
I just think nobody cares enough in the production end of things to make it so.
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