9'' carbine rail disadvantages?

[1911man]

What are the REAL disadvantages of putting a carbine length rail on a mid length upper. I am having a mid length upper built and I bought a carbine length rail on accident to put on it. I really like the rail, should I put a new mid rail on it that the builder said that he would swap it out for another brand or should I tell him to put the carbine length on it ?

[munkeeboi]

Gas tube would be partially exposed. Not sure if there would be any problems aside from the aesthetic ones

[Mute]

Depends on how you use it. I find a 9" rail system just barely long enough to allow me to lay things out the way I like on my carbine. I would probably like a 10" rail more.

[1911man]

Rail

I will be using the upper for target shooting, and hunting.