I know that when I went through the NRA instructor course for the Boy Scouts, it was pounded in our heads that "weapons" were not permitted, but firearms, guns, and rifle was okay.
I try to stick with either of those and avoid the word weapon.
NRA Life Member
Ladyfriend: "I need help with the leaves in the yard"
Me: "Controlled burn?"
LadyFriend: "I forgot my Boy Scout turned into an infantry officer."