By A Mystery Man Writer
Caseless ammunition is a type of small arms ammunition that eliminates the cartridge case that typically holds the primer, propellant, and projectile together as a unit. Caseless ammunition is an attempt to reduce the weight and cost of ammunition by dispensing with the case, which is typically precision made of brass or steel, as well as simplify the operation of repeating firearms by eliminating the need to extract and eject the empty case after firing. Caseless ammunition, in the broad sense
Firearm, Military Wiki
Just noticed that JSSDF forces in manga use the Heckler&Koch G11
Weapons, Neotokyoº Wiki
The Small Arms Calibre Debate
List of 40 mm grenades - Wikipedia
Intermediate cartridge - Wikiwand
Caseless Ammunition Objects - Giant Bomb
5.56×45mm NATO - Wikipedia
Caseless ammunition
Future War Stories: FWS Armory: Caseless Ammunition