Physical description

This is shaped like a small skinny bomb. It has four fins of flat metal riveted to tube. It is all painted blue. It has a nose cap, main section tapers down through three stages to the fins. The tube at base of fins is 23mm internal diameter. Main body diameter is 65mm. Fin wingspan is 95mm tip to tip.
Metals - main body and nose cap is steel. Tube and fins are aluminium.

Inscriptions & markings

Stencilled on main body is: - “GRENADE RIFLE PRACTICE/ M31 (INERT)/ LOT L5-36-6/ LOADED 10-63”