Inert US military experimental 5.6mm SPIW XM110 Flechette. Made for the 1960's Special Purpose Infantry Weapon programme this cartridge is one of the 1st generation types with an FA-T109-type 53mm belted case and a piston primer. The cases were made in 1964 by Frankford Arsenal for the Aircraft Armament Industries who loaded ammunition for the project. The sabot is of grey/green plastic. There is no headstamp.
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