They are made in the same factory as regular Ak rifles. They are patterned after the AK 74 or AK 103 series rifles.The valve, co2, and BB's are all housed within the magazine. The mags are modified AK mags with the feed lips removed.
Semi auto only and all items made by Kalashnikov concern are currently under UN embargo. They are not importable into the USA or Canada currently.
A few were imported to the states years ago along with markarov pistols, the batf had a fit because they used the real arms receivers