Just wondering: what is it chambered in? The magazine is HUGE so I'm thinking it must have a LOT of rounds in it, or it's in .50 cal. Either way it looks like a beast! My only thoughts are that the cocking handle could be a bit larger in case there was a jam, because it looks like it might be hard to clear a misfire.
I don't think you'd have to be afraid of misfires This is SciFi after all, and it's in the future. There aren't lasers as bullets, but the bullets you use are not susceptible to the inconveniences we have in our time