Hi Roald, all
The stock is made of 25mm Birch ply laminated into an overall blank then roughed out to shape with a bandsaw, routed to let in the breech and bottle then finished with hand tools. It's black matt paint with a lacquer coat.
Aluminium - sorry, 'aluminum'

- plate and rods for the adjustable stock parts and trigger guard. Shop bought black placky M4 knobs for the depth stops on the cheek and butt plates.
The barrel band is made of 12mm ply roughed with hole saws and finished to size with files and abrasive paper. I thought it was a nice touch.
Getting the under barrel support shape was the trickiest and it makes you admire the skill of the hardwood stock carvers in dealing with these shapes.
Off to the range on Saturday to try it all out and chrono the new Reg.
I'm getting into this gun smithing - here's a photo of my daughters AA S400, I modified for her for HFT with adjustable cheek piece and a Rowan engineering hamster.

L