The Steyr ACR was a prototype flechette-firing assault rifle built for the US Army's Advanced Combat Rifle program of 1989/90. We only got 4 rounds for it... : r/GunPorn
Slugthrower Sidearms - Atomic Rockets
Steyr-Hahn M1912 - Modern Firearms
Rare guns submission. GyroJet Rocket Carbine Mark I experimental with ammo. : r/ForgottenWeapons