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Shuka Karino is briefly seen handling a Norinco Type 54, presumably taken from a slain opponent, in "First Game". Several more are seen in the hands of various players in "Ignition" and "Fireworks".
The actual firearm that Kaname Sudo is given in "First Game" is a Beretta 92FS; he later uses it (or rather, several others attained via his Sigil ability) against Shuka; he creates and uses more of them during "Ignition" and "Fireworks", primarily using them to shoot out security� cameras.
Ryuuji Maesaka's primary weapon is an RPD, with both Maesaka and his gun initially appearing in "Ignition". Sudo uses his Sigil to create two others during "Fireworks", using them against Ichirou Hiiragi; he also notably uses his Sigil to create overpressure ammunition for the weapon, to aid in dealing with Hiiragi's armor.
Both Rein and Sudo use M67 Hand Grenades throughout "Fireworks" (hence the episode's name); like the M84s, they're a purchasable item in the in-game shop, and are depicted as being somewhat underpowered (releasing no apparent shrapnel), though they're also somewhat oddly painted black.
Rein and Sudo use M84 Stun Grenades in "Ignition" and "Fireworks"; they're apparently a rather popular buyable item in the in-game shop. They're depicted more as simple light-producing devices than as actual stun grenades; in one noteworthy scene, sets one off in his hand, somehow not mangling or burning it in the process.
