the application i see for this
Given its single shot capacity and arms length range, is hitman style executions..
This is predominately a pastime of the criminal fraternity and I wouldnt want to interfere with their cultural traditions and rituals. Also it beats the hell out of drive-by shootings.
Smooth barrel eliminates ballistic tracing, and the entire 'disposable plastic' concept makes it even more attractive.
So the police forensics departments will probably have a whinge about the gun, but I would imagine the bullet, rattling down the 2 cm barrel, will scrape and collect some of the barrel material which could be analysed by said forensics boffins. A chemical 'fingerprint' -such as is used with industrial explosives- could be included in the plastic 'ink' which would allow police to trace the purchasers of that batch.
Not going to be easy, but all stuff which is achievable.
Airplane hijacking just doesnt seem feasible, not enough ammunition to be a credible threat, and probably not enough power to even shoot through the hull (probably the most effective threat you could make with it)
- on the other hand, airport security and credibility went their separate ways a long time ago -
As far as using it as a murder weapon, thats what pistols are meant for. If you want to kill things effectively use a long gun.