Alien Class 9 guns

NOPE, there ain't none! Head to the Arena system via X-3043 and get you a pair of class 9 vanilla guns you like best or better yet, get you some missiles.

If you really want 6 guns, there are ships which support 6 lv. 10 guns. Though I guess in situations of PvP combat, Ryleous is right - missiles could be more useful (depending on your combat style).

Some ships with 6 lv. 10 guns:

2 tizonas whould be conviniant too and the ship komondo dragon in vega is good for this cos it have 2 turrents that way u can use 4 guns 2 misiles and 2 raiper pulse turrents

also try some coalition guns