Yeah my buddy runs a machine shop but unfortunately the way the FM barrel nut is designed you can’t remove the amount of material needed before the nut would fall apart at the two grooves where their cross bolts interface. Hence why I’m looking for other options. They designed everything around pencil profile. The handguard itself is a simple friction clamp and the anti rotation tab is built into the top rail so all I really need is a barrel nut that will fit inside the handguard. I can fab the rest from there. Like I said, this is just a pet project. It’s not to replace my regular ARs, just tinkering with an alternate platform range toy. It may end up being more trouble than it’s worth but I like the challenge.