The stocks themselves are still being manufactured and are available from a variety of sourses. Purchase the gun and then attach the stock. I believe they require a minimum 20" bbl.
I owned one and carried it in a patrol car for a few years. But it was , as others here said, simply awful. Heavy, awkward, even inaccurrate. And the most intimidating weapon around. I even had fellow officers come up and ask it was some sort of 12 gauge machine gun! I can't wait to get another bullpup stock to go on my new 8 shot 500.
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Gunslinger
We live in a time in which attitudes and deeds once respected as courageous and honorable are now scorned as being antiquated and subversive.