Well, brother, write back or call soon - you have a carbine length gas system. 1) A standard carbine freefloat system would go right out to the carbine-length gas port, and stop there. Room for an A2 front sight, with a carbine-length rail. 2) You want to add the A2-type front sight. 3) A carbine-length rail is going to go right out to that A2-type front sight, and stop before it hits it. 4) You asked if they could put a cut-out in that. It's not going to touch it anyway, and a cut-out will leave a hole in the top rail of the freefloat. 5) You'd probably need a MIDLENGTH freefloat, with a cut-out for an A2-type front sight, at the CARBINE GAS SYSTEM position. ^^^ That's what you need to ask them if they can do. Based on the flexibility they've already given, on an option that's not available on their website, I don't think it would be a problem. Gas systems and rails are not synonymous. For gas sytems, you can have pistol, carbine, midlength, and rifle (and "intermediate" and a few others, depending strictly on manufacturer of some "non-standard" gas systems.). Rails don't necessarily follow that. Think A2 front sight, like you are - If I have a carbine gas system, with an A2 front sight, and I put a carbine length rail or freefloat on it, then it's gonna be long enough to extend right up to the backside of that A2 front sight, but not touch it. I don't HAVE to run a carbine rail or freefloat, just because I have a carbine gas system. I can put a lo-pro gas block on that barrel, put on a carbine rail (gas block exposed), or use a midlength rail (gas block inside that rail), or longer rail (with gas block inside that longer rail, too. I'll get some pics up soon, and show you what I'm talking about.