Get the S&W and don't look back. The dedicated uppers can be picky, and cost about the same as having a dedicated gun anyways. A buddy I work with has a SW that probably has well over 20,000 rounds through it and it runs great. Operates just like a normal AR.
The Mossberg 715T is junk.
I used to have a Umarex MP5, it was nice, I ended up selling it for something else, but it worked and looked great.
The Sig .22 semi's are decent, their downfall seems to be magazines (buddy has one that is nothing but issues), and being slightly more ammo picky.
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