Interestingly, a harpoon was fired in space during a test of capturing space junk. Harpoon - tether = gun? Or does “gun” also depend on what causes the projec

Interestingly, a harpoon was fired in space during a test of capturing space junk. Harpoon - tether = gun? Or does “gun” also depend on what causes the projectile to go (gunpowder vs. etc.) and/or the end goal of the device (destroy vs. capture, for example)?