The PP-19 Bizon is a Russiansubmachine gun designed in the early 1990s by Viktor Kalashnikov (son of Mikhail Kalashnikov). The design is based on the AKS-74, while sharing 60% parts commonality with it despite being blowback instead of gas-operated. It uses a high-capacity (64 9ร18mm Makarov rounds) cylindrical helical magazine similar to earlier Calico M950 design, but placed as a foregrip.