I've got a handful of KAC M4 RAS (carbine length) up for sale. The pictures provided are a good representation of the shape they're in (this one is sold). Worn but completely functional. 

The rail will also come with four Knights Armament 11 rib panels. If the listing is up I've still got a rail for ya. Price is shipped to you

**missing screw for top portion of rail. Can be had for about $5-8 in a few different places