Peace on Earth through superior firepower! (In consideration of the season.)
It looks "cool", but (to paraphrase an often heard comment): Why bring a pistol to a rifle fight?
Can you imagine trying to hold an extra five pounds in the air and on target for any length of time?
Then, of course, the question arises: How many "just in case" reloads do you carry? (Magazine failure concerns.)
Let's not forget "balance of the weapon"!
I know mags are pricey, but THIS one, WOW!
Ah hell, let's just write it off as impractical and let it go at that.
GG