This M16 .223 Caliber Bullet Keychain was made from an expended casing. The used primer has been removed and the casing does not contain powder. The bullet has been replaced with an authentic .223 bullet and is mounted on a 1.25 Inch Keychain or you can choose to have us send you a dog tag chain instead. Simply choose from the drop down menu before checking out. We give you the option to add the American Flag or leave it off. Please put your initials, name or other text in the notebox when checking out. Engraving comes in the price of the keychain or necklace. You may also choose from a variety of fonts.