Tuff zone tri-rail - Tuff Zone Tri-Rail Barrel Mount w/6 Slots on Each Rail

I bought this mount because it had QD swivel holes for QD mounts however the holes that are in it, do not allow the QD swivels to lock in ,the mount is a heavy duty mount,i don't know if this happens to be a defect or not, i have contacted the co.directly 2 times & i have yet to get any kind of response about it ,all i can say ,it is a heavy duty mount , i would haven given an ,a plus rating if the qd swivels had worked in it ,i'm only recommending it because it is heavy duty