In the post war years, the bodies of the M21 were purpose made rather than utilizing bodies from fragmentation grenades. The bodies are cast iron with an enlarged unthreaded hole in the bottom. The hole is chamfered to assist in placing the cork in the bottom. The fragmentation pattern is also different than live grenades. The fragments are more pronounced and are quite rounded. The top is threaded to accept the fuze mechanism which could be either the M205A1 or M205A2. It appears that a single supplier was used to manufacture this type of body. The bodies are marked RFX which is Richmond Foundry & Mfg Co. of Richmond VA.
The grenades are painted light blue but the earliest versions may have a darker blue than normal. There are no other painted markings.
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