Information from a JMS playing reach 2nd job in both Infighter and Gunslinger.
Names are the JP version.

If you think this is stolen, it is not.
I first posted this in the guild forum of Honorguards in Kradia.

Proof:

mshonorguards.proboards54.c om/index.cgi?board=howto&action=display&thread=110

mshonorguards.proboards54.c om/index.cgi?board=howto&action=display&thread=109

.::.Infighter.::.

Level: Skill Build
10: 1 Moon kick (Sommersault Kick)
11: 3 kick
12: 3 kick
13: 3 kick
14: 3 kick
15: 3 kick
16: 3 kick
17: 1 kick (maxed) 2 Quick Motion (same as Nimble body, Accuracy from is is MUST)
18: 3 QM
19: 3 QM
20: 3 QM
21: 3 QM
22: 3 QM
23: 3 QM
24: 3 Straight
25: 3 Straight
26: 3 straight
27: 3 straight
28: 3 straight
29: 3 straight
30: 2 Straight (maxed) 1 Double Barrel Shot

.::. Why Not dash?.::.
You move around too much as an Infighter, you will acidently activate Dash, causing you to lose MP, and you need all the MP possible.

.::. Why Kick before Straight? .::.
Moon Kick is compatible with a snowboard or fish spear allowing a better weapon attack than Knuckles. Maxed Moon kick allows you to attack 6 enemies at once, allowing efficient training. Quick Motion comes after that to improve the POOR accuracy. You will basicly never use straight, only for the Infighter Job advancement.

.::.The Stat Build.::.

DEX = Level

STR = Rest of the AP

.::.Gunslinger.::.

.::.Stat Build.::.
(corrected from experience)
STR = Level
DEX = Rest of AP

.::. Level : Skill build .::.

10: 1 Double Barrel Shot
11: 3 DBS
12: 3 DBS
13: 3 DBS
14: 3 DBS
15: 3 DBS
16: 3 DBS
17: 1 DBS 2 Quick Motion
18: 3 QM
19: 3 QM
20: 3 QM
21: 3 QM
22: 3 QM
23: 3 QM
24: 1 Dash
25: 3 Dash
26: 3 Dash
27: 3 Dash
28: 3 Moon Kick
29: 3 Moon Kick
30: 3 Moon Kick

.::. Why Give Gunslingers Dash? .::.
Gunslingers are able to rish the SP to put into Dash. They do not activate dash very often for they usualy just jump and shoot or stand on a platform and shoot. You do not have to Max Moon Kick for it is not an essential skill. Moon Kick would only be used to Knock back a monster away from you.