10/22s with short barrels are great.
I started out with a 12" Tactical Innovations barrel. Why 12" ? I asked them that myself. That is the shortest barrel you can use without modifying a standard stock. That is a real nice length. I was really happy with it.
But, I got talked into replacing the 12" barrel with a 5" barrel.
That is cool also. But, I miss the 12". So, I would like to register another reciever and put the 12" back in service.
Don't half*** it. Get what you want.
Is the shorter barrel going to cost you velocity ?
Sure it is. But this gun pictured below still has an inch more barrel than my 4" Ruger Mk.II
Don't let anyone talk you out of doing what you want to do.