Just noticed that the Ross sniper in the Quartermaster stores (2008) has a bracket machined differently from the one illustrated in Skinnerton's Britishicon sniper book, so yet another variant!

Considering that the Ross rifles were retired before WWII, it might be possible their brackets were robbed and modified to fit the P'14's. Depending on when the P'14 was built it seems more likely that the armourer would use what was at hand or make a new bracket from scratch, rather than trying to find obsolete bits originating in another country.

The extention of the Ross bracket extends forwards, whilst the '03 had a rearward extention from the mounting feet. (A small visual clue, but it might help ID'ing the P'14's bracket origins.)
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