In the 70's when I partnered in gun shop in CA the Stevens pocket/bicycle or whatever you chose to call them pistols and rifles were pretty popular. We had quite a few of them come to us to make new parts for them, for complete restoration back to safe shooting condition, or to at least restore the factory finish and function for a wall hanger. They came in many different barrel lengths from the factory, including as short as something like 6"-8" or there abouts that I remember. They were first made from about in the 1870's, long before the regs on short rifles, so making them grandfathered. Back then anyway, even in CA they were all assumed by even law enforcement to be legal to own, even those with the short barrels. In those days they could be bought for quite low prices, probably adding to their popularity. Many we restored were exceptionally accurate shooters. So much so that my partner even mounted a vintage scope on one he bought to use for tree squirrels that probably had a 10"-12" barrel. It was an easy carry for him to just jump on his dirt bike with to get into the back coutry of the coastal ranges.