Don't you El Reg guys think you're being a BIT sensationalist with this article title? I don't see any evidence of this individual being in ANY way a "gun nut" plus you could NEVER describe the Enfield as a "sniper rifle" (it was never made to be such a firearm).
As others have said, someone found an old receiver and built it up into a functioning rifle. If anything, it's an example of imagination and technical competence.
Get over yourselves Reg-Girls.