[GRIZ]

9mm is most certainly suitable for home defense. I can't tell you much about the Beretta but can relate some of my findings about using 9mm in 16" carbines.

You'll pick up 100-150 fps with 125 gr or lighter ammo compared to a handgun. Don't use subsonic in carbine as you will actually lose velocity due to barrel friction. I've chronographed a couple of subsonic factory loads in a Glock 26, MP5 (10" barrel), and a Marlin 9 and High Point and the results were in the area of 990/1007/960 fps respectively.

As for accuracy I find my marlin or High point will do 6-8" at 100 yds which would make it accurate enough to use at that range.

Based on comparative chronograph results the 9mm in a pistol gives more velocity than +P ammo in 38 special. The extra velocity in a carbine helps ensure expansion of hollowpoints. Not something to hunt rhinos with but respectable stopping power. Would you think a 9MM submachine gun has good stopping power. Yes, you would hit the target with multiple rounds but you should be doing that with any handgun. The carbine is a lot easier to place your shot with than a handgun.

Hope this helps.