In my local town it is considered a firearm , their def. is anything that propells a projectol is a "firearm".
A freind got charged with Discharging a firearm inside the city limits for target shooting his bow in his fenced in back yard.
Lucky for him ,he went to mayors court ,fined $1. The mayor and several oficers shoot at his house. LOL.
Told if the target and back stop were moved inside and he did the "shooting" in his gardge the do good neibor could not complain .

Johnch