[LostinTexas]

There are some calibers that benefit a lot from a carbine length barrel. 9, 40, and 45 APC are not them.
If going to the trouble of a carbine, I'm using a rifle round and get it done.
Not that I wouldn't do some sketchy stuff for a 44 mag, 45 Colt, 454, 460 or the like carbine and six shooter combo. They are in a different category, but still not rifle.

 

[LostinTexas]

Well that depends on the ammunition too.
a 9mm 90gr will benefit by up to 250 fps. The weightier the projectile the less benefit. A 145gr projectile merely breaks even. Even still, there’s a reason while law enforcement doesn’t think theres no benefit. There obviously is. Though for you and me, it seems pointless to use em in close quarters. I’d rather use a handgun.
Now in the Walmart parking lot, when Tyrone Deshaun Jefferson Washington wants to throw a hissy fit 50 yards away…..gimme the carbine. Just not this Henry!

But as someone mentioned, Henry could have done better by developing this with a 41mag, if it’s possible .
As it is, its not going to be a big seller and I anticipate they’ll drop it from the catalog.

Jerry Miculek brought up your same concerns about benefits and admitted there certainly are benefits to 9mm carbines. (hes still fast though up in years now)

There is so much wrong with this., I think I'll just ignore any more posts from you. It's been real.
It is obvious you have a lot to learn, just don't seem to think so.