Suprisingly, this works. It's slow and you can't afford to miss an AC10 shell but a dual hit really hurts people and when you run out of ammo you can still snipe. With a target-info module it's great for quickly opening weakened locations.
I would perfer to use the Dual 20 Cicada than this. The speed is slow, and you have useless armor in the arms.
Mixing the AC10 with a slow engine its not a good idea, cause of the range u need to enter to make it worth the shoot itself, its not a weapon u want to fire at extreme range at all. I think this is better, even having WAY less armour, cause it basically allows for a pure long range build. 20 gauss bullets=30 AC10 bullets in dmg, but they fire it faster, longer, and with less dmg loss. In other words: