The following guns were used in the movie Battle Royale II: Requiem
Wild Seven
Shuya Nanahara Nanahara Shūya,Tatsuya Fujiwara)— The leader of Wild Seven, the Terrorist of internationalism explosion.
Colt .38 Special
Note:It should be S&W model 19,As one of the weapons used in the Battle Royale (I)
AKMSU
AKM
These are all AK-47s, because of their milled recievers. Type IIIs to be more specific. - Gunmaster45
RPG
Students
Takuma Aoi Aoi Takuma,Shûgo Oshinari)— The student of 3B of Shikanotoride Junior High School, Boy #1, focus character.
BR Type 03
The BR Type 03 looks like a modded FAMAS AR, or a Morita carbine from Movie Starship Troopers.
Judging from the safety above the trigger it's possibly a Chinese Type 86s. http://www.ak-47.net/ak47/akbp86.php
Japan
Beretta 92FS
Heckler & Koch MP5A4
M16A2
Trivia
FAMAS
The FAMAS show at Trivia , at they are training . This is TOKYO MARUI airsoft gun.
SVD
You can see Directed Kinji Fukasaku taking the airsoft SVD