Having the rifle at the ready position while submerged is patently ludicrous, but I suppose it was easier for them to animate the rest of the body differently without altering the upper body rigging drastically for the swimming anims.
Funnily enough, something in the same vein as the Gyrojet, if using a monopropellant (includes fuel and oxidizer in one mixture, such as Hydrazine or hydrogen peroxide, as used by space craft), would be more useful than a typical gun, and might have better range than a pneumatic spear gun.
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