Singapore legislation
Regulation 5
of Workplace Safety and Health (Explosive Powered Tools) Regulations 2009
Regulation 5
Protective shield or device
Where a tool is a direct acting tool, it shall have a protective shield or device attached to its muzzle end in such a manner —
(a)
as to effectively arrest the escape of any stray projectile and any other object or particle liberated by the discharge of the tool; and
(b)
that the outer edge of the shield or device is not at any point closer to the centre of the muzzle end of the barrel than a distance of 50 millimetres, except where the tool is used in the circumstances described in regulation 23.