SPIWSpecial Purpose Infantry Weapon
SPIWSpecial Purpose Individual Weapon
References in periodicals archive ?
One aspect of the SPIW program showing some promise, however, involved conventional rifle cartridges firing multiple projectiles.
At typical defensive ranges such a package offers power and downrange performance not seen since the 1960's-era government SPIW program.
I recall reading that the M16 was an interim, stopgap weapon and would soon be replaced by the SPIW (special purpose infantry weapon).