There is a canadian guy that makes a custom one for the Remington PSS stocks that may be useful for you - Rooster33. He also makes them for the Highpower rifles both M1A and M14. He was Very responsive to my direct inquiries about making one for the PSS stock.
I hope I got this link in correctly.
http://www.whamocamo.bizland.com/rooster33/id8.html
I hope I got this link in correctly.
http://www.whamocamo.bizland.com/rooster33/id8.html