I think if you go up the speed of the animation and adds more fire will look much better
Animation speed in your browser != animation speed in game.
Fact: all animation speeds are halved in game. Remember this when everything ought to run at 30 frames per second.
That said, the new one is much nicer. I'd recommend, as per the inspirational thread, cutting the barrels out and making several different ones, and using the main body of the turret as a turret section. It;
1) Allows you to use any weapon you want in that space. Beam, bolt, kinetic, whatever. Just change the gun sprite and stats, and you're away.
2) Avoids weirdness with shots not appear from the end of the gun barrels, which is quite possible with any of the twin guns.