"Ammunition", cartridges or cartridge cases, primers (igniter), bullets or propellant powder designed for use in any firearm, rifle or shotgun. The term "ammunition" shall also mean tear gas cartridges, chemical mace or any device or instrument which contains or emits a liquid, gas, powder or any other substance designed to incapacitate.
(emphasis mine) Yes. You would need a minimum of an FID card to possess that pen in the people's Republic of MA. A. Stinkin'. Pen. Because it is made out of an actual piece of brass - a component used in the manufacture of firearm ammunition - it requires a permit (fee: $100, plus whatever the cost of the required Basic Firearms Safety Course) to own. A. Pen.
That's what common sense gun control looks like, folks.
That is all.