Kinda was inspired by some photos and like the SPR looks, and want to make a clone but in maybe 6.5 Creedmoor. I was wondering if you guys can help identify what Knights Armament Rail part number is used on this particular rifle that someone had previously done in .308? He mentioned in a thread from "that" forum the rail came from an early SR25 MK11 rifle. If you look closely it doesn't have the cut out for the front sight. Any ideas to which RAS and the part number? Below are some links to the rifle that has me wanting to make my own version

https://i.imgur.com/MOaGL8X.jpg

https://i.imgur.com/6HMDSCc.jpg

Thanks in advance for all your help.