Changes: AAI ACR

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AAI ACR

AAI Co. entrant for the US Army's Advanced Combat Rifle Program.

ACR(Advanced Combat Rifle)

The AAI rifle, compared to some of the others, looks quite conventional, but it actually fires fin-stabilized Flechettes, dart-like projectiles, at the high velocity of 1400 m/s and cannot fire conventional ammunition. The rifle is driven by gas piston, and although full details of the breech mechanism have not been revealed, it is said to be derived from earlier AAI design which, in its most efficient form, used three-chambered breech unit which moved very quickly in and out of engagement with the barrel to allow very fast cycling of a three-round burst. There is no provision for full automatic fire. A four-power sight is fitted (ACOG), with iron sights as backup, and the muzzle carries a rather unusual compensator / muzzle brake which has been especially designed to work with Flechettes.The Barrel is rifled with very slow twist - one turn in 85 inches - which gives the Flechette a degree of roll stabilization and helps accuracy. The Flechette idea is not new, several makers, including AAI, experimented with Flechettes as rifle projectiles in the 1960s, but at the time the materials and construction of the Flechette cartridge was not particularly good. By now new materials and improved technology has made the Flechette concept more acceptable, and the AAI rifle was considered a good design, although not sufficiently accurate for purpose intended.

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 ==ACR(Advanced Combat Rifle)==
-The AAI rifle, compared to some of the others, looks quite conventional, but it actually fires fin-stabilized Flechettes, dart-like projectiles, at the high velocity of 1400&nbsp;m/s and cannot fire conventional ammunition. The rifle is driven by gas piston, and although full details of the breech mechanism have not been revealed, it is said to be derived from earlier AAI design which, in its most efficient form, used three-chambered breech unit which moved very quickly in and out of engagement with the barrel to allow very fast cycling of a three-round burst. There is no provision for full automatic fire. A four-power sight is fitted (ACOG), with iron sights as backup, and the muzzle carries a rather unusual compensator / muzzle brake which has been especially designed to work with Flechettes.The Barrel is rifled with very slow twist - one turn in 85&nbsp;inches - which gives the Flechette a degree of roll stabilization and helps accuracy. The Flechette idea is not new, several makers, including AAI, experimented with Flechettes as rifle projectiles in the 1960s, but at the time the materials and construction of the Flechette cartridge was not particularly good. By now new materials and improved technology has made the Flechette concept more acceptable, and the AAI rifle was considered a good design, although not sufficiently accurate for purpose intended.
+The AAI rifle, compared to some of the others, looks quite conventional, but it actually fires fin-stabilized Flechettes, dart-like projectiles, at the high velocity of 1400 m/s and cannot fire conventional ammunition. The rifle is driven by gas piston, and although full details of the breech mechanism have not been revealed, it is said to be derived from earlier AAI design which, in its most efficient form, used three-chambered breech unit which moved very quickly in and out of engagement with the barrel to allow very fast cycling of a three-round burst. There is no provision for full automatic fire. A four-power sight is fitted (ACOG), with iron sights as backup, and the muzzle carries a rather unusual compensator / muzzle brake which has been especially designed to work with Flechettes.The Barrel is rifled with very slow twist - one turn in 85 inches - which gives the Flechette a degree of roll stabilization and helps accuracy. The Flechette idea is not new, several makers, including AAI, experimented with Flechettes as rifle projectiles in the 1960s, but at the time the materials and construction of the Flechette cartridge was not particularly good. By now new materials and improved technology has made the Flechette concept more acceptable, and the AAI rifle was considered a good design, although not sufficiently accurate for purpose intended.
 ==See also==