The vector is super front heavy, and takes a lot of getting used to. I've owned 2, the first one I got fed up of the awkwardness (reloading is tricky) traded it, then I got the itch and traded for a 2nd one and almost immediately traded it away again lol also mags for it are stupid expensive.
Never used the MSK, but I've owned a few WE GBBRs and I gotta say, getting parts is easy, an NPAS makes it both indoor and outdoor ready and parts are cheap and easily available.
My .02
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