Steyr IWS 2000
The Steyr IWS 2000 is an Austrian Single-shot Bolt-action anti-materiel rifle produced by Steyr Mannlicher. IWS stands for Infantry Weapon System. Like many modern anti-tank rifles, and indeed also modern tank guns, it is actually a smoothbore weapon and not a true rifle. This can help accelerate projectiles and increase ballistic effectiveness, but the lack of rifling imparting an inertial stability requires the projectile have stabilizing fins. It fires a 15.2×169mm armor-piercing, fin-stabilized discarding sabot round (207 mm long), and is the first man-portable rifle to use this type of ammunition.
The Steyr IWS 2000, left side view
|Type||Single-shot Bolt action anti-materiel rifle|
|Place of origin||Austria|
|Mass||18 kg (39.7 lb)|
|Length||1,800 mm (70.9 in)|
|Barrel length||1,200 mm (47.2 in)|
|Cartridge||15.2×169mm (IWS 2000 and AMR 5075)|
|Cartridge weight||150 g (5.3 oz)|
|Muzzle velocity||1,450 metres per second (4,757 feet per second)|
|Effective firing range||1,000 metres (1,093 yards)|
|Maximum firing range||2,500 meters (2,734 yards)|
|Feed system||Single shot, no magazine|
|Sights||10x Telescopic sight|
The first variant of the weapon was the proposed AMR 5075. AMR stands for Anti-Materiel Rifle. It is proposed to use the same ammunition type as IWS 2000 and it use 5-Round detachable box magazine. However this variant doesn't pass the proposal stage.
The weapon is based on a 25 cm (9 3⁄4 in) long recoil mechanism. This mechanism, usually found in shotguns, helps manage the heavy recoil forces of the 15.2 mm Steyr APFSDS round due to its damping effect that allows for force distribution over a longer period of time. Another unusual feature of this weapon is the movement of the barrel. After firing, the barrel recoils into a shock-absorbing hydro-pneumatic sleeve much like those found on a LG 1 Mark II 105 mm Howitzer. The IWS 2000 also uses a multi-baffle muzzle brake to distribute muzzle energy and further reduce recoil, similar to the ones used on D-30 2A18M 122 mm Towed Howitzers. The entire rifle body is made up of a combination of high-tension plastics and superlight polymers to increase manageability and cut down on weight. The smoothbore barrel is easily detached and packed away for increased mobility. The APFSDS round is inserted from the side of the weapon, much like usual Single-shot rifles.
The projectile is a 15.2 mm fin-stabilized discarding-sabot type with armor-piercing capability which the IWS 2000 was specifically designed to fire. It contains a dart-shaped penetrator of either tungsten carbide or depleted uranium, capable of piercing 40 mm of rolled homogeneous armor at a range of 1,000 m, and causing secondary fragmentation. The cartridge consists of a plastic case, a steel head, and a plastic sabot shell around the penetrator.
- "Steyr AMR information sheet". Retrieved 28 November 2011.