Moddedta

I'm curious if anyone is using a upt semi stowless in a vector 2. I recently had my rig at upt for modifications and wanted to order a bag for it. I was told the semi stowless wasn't designed for the vector 2 and will not fit. I find this a little hard to believe as I have seen them used in other manufacturers containers. So if you have one please give some input on the part number you are using and how it works in the vector 2