Let me see if I can decipher it:
you ordered an flat top, 16" carbine
you received a A2 carry handle 14.5" shorty AK
I've got a carbine and a shorty AK. While the AK muzzle brake works, it really isn't worth the noise or the loss of velocity.
If you ended up with a standard carry handle and wanted a flattop, that's the real crux of the question.
What optics are you thinking? For an ACOG or Reflex II, you are fine with a carry handle model. You might actually be better off, since you have built-in backup irons.