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. Kasahara (Nana Eikura) and Captain Genda (Jun Hashimoto) wield these weapons. Various LDF soldiers are seen with the P9 in their holsters.
For some reason, not enough Minebea M9s were available for the LDF extras during production. The Mini Uzi was used as a stand in for the Minebea M9, due to the latter being based on the Mini Uzi. The folding stock appears to have been removed
Error creating thumbnail: File missingMini Uzi SMG with stock folded - 9mmError creating thumbnail: File missingA Mini Uzi is seen behind a Minebea M9. Note the 2 ribs on the receiver and the shape of the rear of the weapon. There is also a gap where the folding stock used to be.Error creating thumbnail: File missingAn LDF soldier is firing a Mini Uzi mocked-up as a Minebea M9. Note the shape of the rear of the weapon, and the crude front grip. The longer barrel is missing the holes for the flash hider, indicating that this is a rubber stunt weapon.
Howa Type 64
The Howa Type 64 is used as a training rifle for all recruits prior to indoctrination into the LDF, most noticeably Tezuka (Sota Fukushi) and Kasahara
Error creating thumbnail: File missingNana Eikura firing an actual Type 64 loaded with live ammunition at JGSDF Camp Iruma during the filming of this scene. The JGSDF had loaned parts of the camp and vehicles for filming, as well as advisers and extras on the set
Howa Type 89
The Howa Type 89 is the main assault rifle of the LDF.
Error creating thumbnail: File missingHowa Type 89 - 5.56x45mmError creating thumbnail: File missingKasahara crawling under barbed wire with a Type 89.Error creating thumbnail: File missingDojo swaps his Minebea M9 for a wounded LDF soldier's Type 89. Oddly enough, none of the LDF soldiers on the ground were seen using Type 89 rifles against the MBC.Error creating thumbnail: File missingAn LDF door gunner firing his Type 89 at advancing MBC troopers below from a UH-60J Blackhawk (which was borrowed from the JGSDF during production). Note the brass being ejected.Error creating thumbnail: File missingCloseup of the LDF door gunner's Type 89. The muzzle flash and brass being ejected appear to be genuine, and not post-production CGI typical of Japanese films. It is possible that the door gunner was played by an actual JGSDF member.
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.
The standard submachine gun of the MBC is the Heckler & Koch MP5A4. These weapons are occasionally seen outfitted with Surefire 628 forearms and, on one occasion, sound suppressors attached to the muzzle.