Cut and paste the link into your browser.
Hard to tell from the angle and lack of visible details, but due to the rails being numbered and the cutout in the the rails around the screw hole (2nd from last, towards the stock) I'd be leaning to say it's the G&P one.
http://www.gp-web.com/en/productspop.php?pid=121
That gun would be hotter with a slither stock or even a folder (like
this).