removed the sling stud, and the block goes at least that far, which is like 2 inches from the end of the stock. Looks like I'll be learning how to drill and tap into Aluminum, then install with some 832 or 1032 screws.
This is the rail
I'm planning on using. Will order it tonight so I can get it and start some planning as far as how I'm going to situate it. It says I can use the sling stud for one fastener, dependig on how that looks, that could save be drilling 2 holes. Won't be getting the bipod for a while, but this will give me something to do