Aftermarket 5-shot magazines are available and make a much nicer sporter IMO. But the Brit gunsmiths seem to have made both 5 and 10-shot custom Lees.

I'll look up that AR article. Think I remember they used a Bishop semi-finished stock. It needed to go on a starvation diet....and lose the "white line fever." The Brits had the right idea--long and SLIM.