At least, according to the Russian gun laws.
As I already wrote, in Russia you can get a rifle license only after you’ve owned a shotgun for at least five years. A few years ago TechKrim, a gun and ammo developer from Izhevsk, figured out a way around this legislation. The law makes an exception for “Paradox” bores, that have rifling only in the last 150 mm. of the barrel or less; in addition, Lancaster’s patent “oval bore” does not have any rifling, and so is legally a smoothbore. IzhMech (Baikal) was the first to take advantage of it and offered 20-gauge shotguns with Lancaster’s oval rifling, but TechKrim went further.
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