The muzzle protector fitted over the end of the barrel to protect it from where when using the cleaning rod. In British service, they were carried in the spare parts wallet or left on the cleaning rod in the spare barrel case.
- Cat No. C1/BD 2525, List of changes A 3312 and B 5792, PROTECTORS, MUZZLE, VICKERS .303-IN. M.G., Mk. 1
- Cat No. C2/BG 0890, List of changes A 7772, PROTECTORS, MUZZLE, VICKERS .5-IN. M.G., Mk. I
Specific source references can be provided if required.