Gunslinger Build (Lv. 10-200)

Uh, Ice Splitter is better than Flamethrower, but it's not really even an option there - I can't think of any reason to not get at least 25 Ice, though there are quite a few arguments for not getting Flamethrower. It's still a Flamethrower or Gaviota debate (I'm on the Flamethrower side).

Outlaw mobbing is basically macroing Flamethrower-Ice and using that, or rapidly alternating between the two. It's quite pretty to watch. You almost always want to use Ice right after Flamethrower since you can't spam either, but you can fit one in right as the other cools down.

The build looks good. About the 1 point in each skill thing - that's just for fun, right? 1 Ice is useless, I'd either get 13 or 21, or leave it until after you get 21 Octo. 1 Gaviota's half as good as max, so one point early on is great. 1 Homing is a great investment, I use it on every miniboss and makes things much easier (shoot them and freeze their summons, they can't do anything to block your range )

Octopus is absolutely useless until 11 and I still wouldn't use it much until 21.

can you recommend a good FT build?