[B. Dudley]

The barrels look to most likely be an aftermarket set. There are no markings on them at all?
They could be a set of Vickers barrels, but they were usually marked as so on the top rib or the bottoms of the tubes in front of the chambers.

Your gun would have originally been fitted with Twist Steel barrels.
So, the aftermarket set could have been fitted to the gun back in the days when all composite barrels were "unsafe" to shoot.

What is the clover in the stock? is it on the surface or is it an inlay? If inlaid, it most likely is covering up a bolt or screw through the head of the stock.