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they are capable of shooting pyrotechnic signalling rounds only if an adaptor at the muzzle is attached;
they have a durable device within the device that prevents the firing of cartridges loaded with single or multiple solid shots, solid bullets or solid projectiles;
they are designed for a cartridge listed in, and complying with the dimensions and other standards referred to in, Table VIII of the Tables of Dimensions of Cartridges and Chambers (TDCC) established by the Permanent International Commission for the Proof of Small Arms (C.I.P.), as that Table applies in the version in effect at the time of adoption of this Directive.
For devices designed to fire only blanks, the barriers are wholly made of a material which is resistant to being cut, drilled, bored or ground (or any similar process) and which has a minimum hardness of 700 HV 30 (according to the Vickers hardness test).
For devices not covered by the second subparagraph of this point, the barriers are made of a material which is resistant to being cut, drilled, bored or ground (or any similar process) and which has a minimum hardness of 610 HV 30. The barrel may have a channel along its axis to enable the irritants or other active substances to be expelled from the device.
In either case, the barriers are such that they prevent occurrence of the following:
creation or enlargement of a hole in the barrel along its axis;
removal of the barrel, except where the frame and chamber area of the device is rendered useless as a result of the removal, or where the integrity of the device is so compromised that it cannot be used to form the basis of a firearm without significant repair or addition.
the cylinder chamber front openings are narrowed to ensure that bullets are blocked in the chamber;
those openings are offset to the chamber.