I had an Automag in 22WMR back in the 80s. When it worked, it was a hoot, with a huge ball of fire lighting up the night from the muzzle flash. But the weapon was unreliable. The main problem was finding good magaznes. Even at 1200 ft/sec, it is still a deadly round. Maybe that plastic one will work better. Back then, the 6" barrel AMT Automag was rated at around 1600 ft/sec muzzle velocity. That will hurt you bad.