If you mount two of the same, you go through your ammo twice as fast. Grab a Sidewinder as well, or a Paralyzer, and mount some buckshots (if you're BHG or maybe merc) and you're better off.
Or, if it's in your class9 slot, get a Firestalker as well. Nomad Cannon are Class10 I believe, but Firestalker is Class9 so will fit in your other slot.
But if you're mounting buckshots and not codies, pick up that Sidewinder. Bigger punch and less cost/missle. (never figured that one out).
