I will be conducting a Product Test of this new stock from ATI that arrived today. It's a brand new stock that should be available in the very near future and appears to fill a real need for a conventional stock with an adjustable length of pull.
It's designed to fit a variety of shotguns, including Remington, Winchester and Mossberg models.
You can take a look at it at http://atigunstocks.com/index.aspx
I'll post a link to my Product test at http://www.allaboutshooting.com
as soon as it's completed.