|"This weapon isn't functioning properly! Send it back to the armory and perform the necessary repairs to make it functional again."|
The Steyr ACR makes full use of the Bullpup design and Flechette rounds, chambered in 5.56. The Flechette rounds were proposed due to their said ability to fly longer and straighter than a conventional bullet, but had its own negatives to knock down these positives as the sabot's(used to help the projectile fit the barrel) fired out of the barrel could be hazardous to friendlies next to the shooter amongst other documented flaws.
The ACR was Steyr's entry for the US Army's Advanced Combat Rifle (ACR) program in the late 80's / early 90's. The Steyr ACR was one of the top 4 that were reviewed, but none managed to meet the army's requirement of 100% improvement over the M-16 and therefore none were accepted.