Trail gun? Yes. The 5.7x28mm cartridge is only slightly more powerful than the 1959-issue .22 WMR, Wichester Magnum Rimfire, also known as the .22 Magnum. When I say slightly, I mean slightly. Barr Soltis, reporting on Chuck’s page, noted that the 5.7 is only about 21 foot-pounds energy more energetic than the .22 Magnum, keeping format similar (SMG to rifle, auto pistol to revolver). Of the loads Hasan would have been able to get, the most kinetic energy his gear could have yielded per round is around 216 fpe.