All weapons used by the LDF are known to be used/taken from JSDF stockpiles as "donated" by local governments to defend libraries against the Media Betterment Act (MBA).
Minebea P9
The main sidearm of the LDF is the Minebea P9, a licensed copy of the SIG-Sauer P220 manufactured by Minebea and Shin Chuo Kogo KK. LDF soldiers, including Iku Kasahara (Nana Eikura) and Captain Ryusuke Genda (Jun Hashimoto), wield these weapons.
[[Image:LWLAUSP-7.jpg|thumb|none|600px|Kasahara (Nana Eikura) orders the Bakushukai leader, Kenji Takeyama (Kazuma Suzuki) to surrender with her P9.]
Minebea M-9
The primary submachine gun of the LDF is the Minebea M-9, a copy of the Mini Uzi manufactured under license by Minebea.
Micro Uzi (Mocked-up as Minebea M-9)
For some reason, not enough Minebea M-9s were available for the LDF extras during production. The Micro Uzi was used as a stand in for the Minebea M-9 for some scenes. The folding stock appears to have been removed
Howa Type 64
The Howa Type 64 is used as a training rifle for all recruits prior to indoctrination into the LDF, most noticeably Hikaru Tezuka (Sota Fukushi) and Kasahara.
[[Image:LWLAT64-1.jpg|thumb|600px|none|Tezuka (Sota Fukushi) and Kasahara running laps with the Type 64. For some reason, they are drilling with magazines inserted.]]
Behind The Scenes
Howa Type 89
The Howa Type 89 is the main assault rifle of the LDF.
Remington M24 Sniper Weapon System
The M24 Sniper Weapon System is the LDF's standard sniper rifle, and is equipped with a Harris bipod. It's possible that these weapons are airsoft replicas, since none are seen ejecting brass, and the muzzle flashes appear to be post-production CGI.
M84 Stun Grenade
Dojo throws an M84 stun grenade into a room during a hostage rescue. It's surprising that the LDF never employ stun grenades during their battles with the MBC, despite their fighting doctrine and less-than-lethal nature.
Media Betterment Committee
Heckler & Koch MP5A4
One of two submachine guns of the MBC is the Heckler & Koch MP5A4. The MP5A4 supplements the more common MP5A5 fielded by the MBC. These weapons are occasionally seen outfitted with Surefire 628 forearms and, at least one is equipped with a tri-rail forend, though it doesn't have any attachments mounted to it.
Tokyo Marui MP5-J
The most common weapon seen in the hands of the MBC. Many are equipped with the Surefire 628 forearms and flashlights, and some have receiver-mounted rails. The Tokyo Marui MP5-J is the airsoft version of the Heckler & Koch MP5A5. It could be differentiated from a genuine MP5A5 by the shape of its unique flash hider, supposedly developed for Japanese law enforcement.
Bakushukai Militants
Heckler & Koch USP Compact
The Bakushukai leader, Kenji Takeyama (Kazuma Suzuki) uses the Heckler & Koch USP Compact as his personal weapon.
Norinco Type 56
At least one Bakushukai Militant is seen wielding a Norinco Type 56 in the film's intro.
M2 Flamethrower
One of the Bakushukai Militants uses an M2 Flamethrower to burn down the Hino Library.