Anti body armour

Ever thought of getting something like a Cressi-Sub Star SL-40? No rubber bands, the tip will open up if someone tries to remove it, so it has to be pushed all the way through or microsurgery is necessary, should go through body armour, replacement spears are available, can be loaded in less than a second, nice and small, pneumatic/compressed air piston, holds a charge and does not have to be charged every shot, comes with a pump so you can regulate how powerful it is. Just as powerful as one of the 6ft band powered guns, so I hear. I reckon more, or at least, as powerful as a decent crossbow. Smaller though and faster to load.

Thoughts?