I too do not like the term weapon. Weapon implyes intent to do harm to others.
Now if someone is trying to do harm to me, anything near me will be used as a weapon, bowling pin, bowling ball, lacrosse stick, frying pan, or fire arm.
I own firearms that have multiple purposes, most are primary target guns, and I own too many to name.
but on the Viking theme I guess the Sig P220 Sport could be "Bullseye slayer" or "bowling pin thumper". Ill let you deside.
I guess I do have a knick name for my Gerber Air Ranger pocket knife. "Pocket chisle".