The legality is no doubt moot given the context. Anyway, here’s what I found…

Council Directive 91/477/EEC of 18 June 1991 on control of the acquisition and possession of weapons - EU Law

Category A - Prohibited firearms

1. Explosive military missiles and launchers.

2. Automatic firearms.

3. Firearms disguised as other objects.

4. Ammunition with penetrating, explosive or incendiary projectiles, and the projectiles for such ammunition.

5. Pistol and revolver ammunition with expanding projectiles and the projectiles for such ammunition, except in the case of weapons for hunting or for target shooting, for persons entitled to use them.