A single shot underbarrel grenade launcher whose ribbed barrel slides forward to load, with its own trigger, grip and ladder sight, mounting under a host weapon on an underbarrel rail. Dimensions 0.061 x 0.109 x 0.320 m (X x Y x Z). Origin at the footprint centre with the grip toe on y = 0; the mount port is the top face of the clamp block; metre units, +Y up, muzzle and point toward +Z. Named pivots: pump at (0, 0.0612, -0.1). Connectors: mount underbarrel at (0, 0.0722, -0.03) facing +Y; muzzle muzzle at (0, 0.0612, 0.16) facing +Z. The barrel slides forward along the bore on its own node to load. The latch, the trigger linkage and the safety are modelled and left static. Rigid node-transform clips open, close drive named nodes on their own pivots. No skinning and no skeleton. Blued gunmetal, bright machined steel, dark anodised alloy, black and dark earth polymer, rubber, walnut, brass, copper, leather, olive paint, optical glass, concrete and emissive red, green and warm white for reticles, lasers, tritium and lamps. Physically based flat colours with no texture maps. Original invented design: no real make, model, manufacturer or marking is represented. Free 3D model for Unity, Godot, Unreal, three.js and Blender. No collision or navigation data.