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Playability mainly. For a primary to run on gas means you're not going to be doing a whole lot. Electric is the standard for the main reason that batteries last the longest and require less work after getting started.
It'd be very "unrealistic" if you had to worry about not only how much ammo you have, but also how many times you can reload before it doesn't matter.
Would you rather have the bolt blow back after each shot or be able to reload more than 4 times?
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