
Humphrey Boggard |

For a one-shot one of the players has rolled up a three-armed gunslinger 6/alchemist 2. With the help of TWF feats he is shooting five times a round and having a ton of fun surprising people with the third arm.
I'd like to help our (newby) GM create a four armed gunslinger to give the PC a truly memorable duel. It doesn't have to be made using character creation rules, a monster would be fine but I'm hoping for something that will give a fairly optimized 8th level character a run for his money. What would you all suggest?