「I read a bit more of Rushi’s blog, and he’s a student who used that picture to make a banner for his shooting club. I haven’t found anything to say exactly what sort of rifles they shoot, but two days ago he was delighted to finally get a permit so he can start practicing: “yatto renshuu dekiru yo!”.
I found scattered links to college rifle competitions in Japan, but no details on the guns. I’d guess .22LR for college clubs, maybe air rifles at the high school level.」