This as you would have guesed is a Z6- Rotary Blaster Cannon a.k.a: clone Gatling gun which was used by the GAR (Grand Army of the Republic). The two most notable users of this gun were: Hevy and Jek.
Here are the pieces you will need.
Now connect the tap piece to the 1 by 1 round plate.
And attach the megaphone.
Another 1 by 1 round plate.
And now the technic pin.
This is my desighn if by a crazy coincidence someone has the same desighn I DID NOT COPY IT and I am sorry. You can use this - just give me credit:)you can use it but remember in the wise words of Commander Cody:
LoL a big gun doesn't make a big man. Great design. I like how jek says ok clankers suck laser but Hevy's version is better. "You didn't say please." Or Hardcase in Umbara "Hey where are you going, come back there"!!! Anyway it looks really cool and accurate, great job Waxer.=D