Commission Implementing Directive (EU) 2019/69 of 16 January 2019 laying down technical specifications for alarm and signal weapons under Council Directive 91/477/EEC on control of the acquisition and possession of weapons (Text with EEA relevance) (c. 69)

ANNEX U.K. Technical specifications for devices referred to in Article 1

7. In all cases, whether the device falls within point 5 or point 6, the first barrier in the barrel is placed as close as possible after the chamber of the device while allowing the expulsion of gases through exit holes. U.K.