Ok INGO, I've exhausted all of my searching skills and I'm ready to contract this research out to you. I currently have an A2 style upper. What I would like to do is free float the barrel, preferably with an MLOK handguard, while still keeping the front sight post. The only thing I can come up with is to find a handguard that is exactly 12.5 inches long which will fit in behind the post. The only handguard that I can come up with is the PRI Gen 3. Im not opposed to something similar to some of the older drop-in rails that had the A2 cut out, as long as it's free-floated. Anybody have any suggestions?