Just a minor correction Partrick, but CR to the part number on the butt trap is the prefix to the complete part nuimber of the part and not 'component, rifle'. India still use their own part numbering system that they took over from us after independence and as a republic. It is from the old post war Ministry of Supply B1/CR system. They still use B1 as the VAOS heading for bolt action rifles, so the part numberof the butt trap in the Indian Ordnance system will be B1/CR 1336.
This old MoS numbering system together with the various suffixes of SA, GA or just A are apparent on the body sides of their Mk3 and L4 Brens, such as C1/CR 1234 MA