Personally, I think avoiding calling a gun a weapon is kinda caving to the antis; if you assume that there's something wrong about owning weapons and resort to semantic wankery to camouflage that, they've already won a victory.
There is absolutely nothing wrong with owning personal weapons. I own several, and I see no reason to hide this (note my .sig

).
Maybe the simplest way around this would be to simply call the gun what the antis say it is: a deadly concealable high-powered semi-automatic assault pistol, a terrifyingly devastating close-range combat shotgun capable of blasting cop-killer slugs through cars, a deadly high-powered long-range precision sniper weapon, etc...
If we adopt their hysterical terminology of terror, it'll take one of their best weapons out of their hands and neutralize it. Sometimes sarcasm can be really effective, and if the fencesitters hear us using those terms laughingly, the next time Wendy uses them they won't have quite the same impact...