Looks decent, I'd have to reccomend a BCM KMR. The only problem is they're right around $250, but well worth it IMHO. They're super light and I love the keymod design, it makes swapping accessories a breeze. If it were me and I was installing a full float rail I'd use a lopro block, but depending on what rail and it's length you might not have to. Check out AR15.com, go to their equipment exchange, theres always a ton of stuff for sale there. If you go to the AR 15 section there a ton of info and a bunch of knowledgable guys there.