Inert US military experimental 5.6mm SPIW XM144 Dummy. Made for the 1960's Special Purpose Infantry Weapon programme this cartridge is one of the 1st generation types with an FA-T148-type 44mm case and conventional primer. This smaller cartridge was developed concurrently with the XM110. The entire cartridge is cadmium plated. This was made by Frankford Arsenal and has no headstamp.
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