To me, it's very ugly. Aside from that, I wonder the range it would have with any accuracy. Could you hit a coyote sized target at 100 yards and would it have any energy left?
I can't speak to the henry in particular I have not shot one.
I have had a couple PCC configurations based on 9mm glock mag fed AR-9 a 10.5" a 16" and my son had a 5.5" with a light weight aluminum tube to make it a total of 16 inches that was pinned and welded
what you get with the longer barrel is some more speed
going from a 4 inch barrel common pistol , to the longer barrel, there is little change between 10.5 and 16 inches because there wasn't that much powder to burn and it is mostly all burnt by 10.5" .
it is powder dependent different powders will have more or less added velocity.
but when you pick up around 250 fps from the longer barrel.
your round from the 16 inch PCC or 10.5 inch barrel braced pistol is approximately the same at 80 yards as it was at the muzzle with the 4 inch barrel.
by the way the reason for the 5.5" barrel with the aluminum tube is to keep pistol velocities for competition shooting where they set maximum velocities
that way your 9mm pistol and PCC can run the same ammo and you don't have to keep two ammos and keep them separate from each other to keep your power factors correct and no damaging targets.
so you get more out of a 9mm from a longer barrel enough so that you basically take 80 yards off the distance and you are back to the same velocity as the pistol.
So would shooting a coyote at 20 yards with your 9mm pistol be effective? I haven't done it but it should be reasonably so
as for accuracy hitting a pie plate standing with the pcc is not an issue at 100 yards I am sure it depends some on the ammo but it wasn't a problem for me to get hits.
the role of these PCC besides being fun to shoot and train with at a lower cost is that your pistol and the wife's PCC can use the same ammo and same magazine. so now you have one ammunition feeding device for both your guns , you can not only share ammo but share magazines
from henry's website
For maximum reliability, Henry recommends the use of double-stack 3rd, 4th, or 5th Gen OEM Glock® G17 or G19 magazines, OEM SIG® P320 magazines, and OEM M&P® double-stack magazines with their respective magazine well adapters.
training is great because you can shoot steel at pistol distance targets and stretch out to 100 yards and everything in between.
it isn't the most powerful thing around but it is more powerful than the 10/22 so you are talking a center fire that weights around that of a 10/22 the henry is a little more weight at 6.6 pounds
besides training it is really a inside 100 yards and closer to pistol distance tool for bump in the night type stuff where the same mag and ammo feed the carbine and the handgun.
most people can just shoot a carbine faster and with greater accuracy than a handgun
the down side is it is harder to carry a carbine than a pistol.
for people looking to have ammo and mag compatibility it is a win and great for lower cost and noise training over more traditional carbine calibers like 5.56