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this guy's got a duel-stage rifle... the canister in its left hand is a helical-feed ammo tank.
it has multiple feed lines for various types of ammo. 20mm caseless, morphing rounds...
the initial stage of the bullet is the chemical propellent in the round, the second stage is
an electro-magnetic rail, used when necessary, to triple the muzzle velocity of the bullet..

quick colour version