Handguard question on lengths mid/carbine

[eighty duece]

I am trying to figure out this rail I have. I believe it is for a carbine length, the question is how far off would it be from a middy? I have a middy upper on order but I dont have anything to measure off of. As far as standard front sight placement goes, how far off am I? Basically what is the distance to front sight on carbine/middy? If I have to whack a couple inches off the top/bottom rail to acomodate that is fine.

[BPTactical]

Rifle is about 12" OAL
Carbine is about 6.5-7"" OAL
Spectre/Mid is about 9" OAL

[eighty duece]

This was for a carbine, 6" from rear to cut out for sight, then it gives me what 3" for the front sight. So to put it on a mid I would have to whack another inch or so from the top rail forward of the cut out to fit the front sight tower?

I will figure it out when the upper gets here, I am just trying to get a game plan made.

[BPTactical]

Look me up when it comes in-I'll mill it out.