An RDS 1x ACOG clone would probably be more suitable for that gun if you like it with the ACOG look and looking to use it in CQB. I don't care for it myself.
However, an MP5 is only a CQB weapon in real steel. In airsoft, a well upgraded MP5 with an extended barrel hidden by a suppressor makes a very viable outdoor gun that can perform every bit as well as an AK or Armalite. Hell, my stock custom MP5 has a standard length barrel, and I was accurately tagging a tree with a 12" diameter trunk at about 125 feet away, making it a pretty decent choice for outdoors use. . So I can see a 4x optic actually being of practical use in an outdoors game, even though it's cosmetically questionable.
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