Trench Firing Device?

[AD-4NA]

I saw this interesting No1 MkIII rifle at auction a while ago and have been meaning to have the experts and WWI aficionados here take a look at it. Does anyone recognize what all those attachments to the rifle are? My best guess was that it was some sort of trench firing device or some sort of gas system for a self loading/semi auto conversion. It looked too complex to me to just be a smoke discharger conversion and mounting system. The 1914 production date makes it a little more plausible or intriguing also. I never noticed it come up for discussion on the forum but thought it was quite interesting.

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