Jumping in late: The old Remington 550, a tube-magazine semi-auto, didn't care about shorts, longs, or long rifles. You could mix or match. They're reasonably accurate, as well.
The 552 is an updated version.
They're both pretty much "full-sized" guns, not kid-sized shorties. (Although I had mine when I was a teeny-bopper.)
You could run an "I want" ad on various websites, or travel to some larger gunshows...
Art