The BB and pellet replicas are actually not very powerful. Be sure to consider an airsoft replica. In particular, your friend will find that KWA replicas are very
much like the real thing and, in fact, are advertised as training pistols. In comparison the Sig P320 replica is not fully functional and much like a toy.
I made a video of my KWA Sig P226 replica, see https://www.youtube.com/watch?v=WdjO72pfunA&t=6s