Agreed. If it's a bullet of some sort I've never seen one but a picture of the base showing whether or not it has a primer and any possible markings would help greatly. Even a headspace guage which is not actually a bullet and has no primer will have the size & caliber marked on it somewhere.Is it heavy for its size? More like solid metal?
How about a pic of each end?
LOL.. For launching rocket grenades from the barrel of your 9mm pistol ?Could it be a grenade launching blank? This would be much cooler than a starting pistol :-D