Weapons for Anti-Gunner Veteran

So i found myself a four-stack (YAY!) but it has fallen on me to clear the gunners in havoc.

What weapons do you recomend for that? Ive been using the Recon Las and the Spearhead Boltgun so far (Plasma lacks range imo)

I also got the Braced autogun but i think its not accurate enough past 30m range.

Which guns would be best for "counter Battery" fire? :D