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The German GSG-9 is one of the best anti terror units in the world. This unit uses the DRS 1 as its sniper rifle .
The DSR 1 is a specialized sniper rifle (not a conversion of the standard military or hunting gun). It is adopted by German GSG 9 counter-terror group, as well as by some other elite European law enforcement agencies and certain non-European military Special Operations forces.
The DSR-1 is configured into bull-pup design, with free-floating barrel. The folding bipod is mounted onto upper rails (above the barrel), and the adjustable horizontal front grip is mounted on the lower rails (under the barrel). The rifle features fully adjustable buttstock and cheekpiece. The holder for spare magazine is installed in the front of the triggerguard to decrease reloading time or to have different type of ammunition (i.e. armor piercing) handy. DSR-1 action features match-grade, fluted barrel that is quickly interchangeable and is fixed into receiver by three screws. The action is designed for .338 Lapua Magnum ammunition, with conversion kits available for smaller calibers such as .308 Winchester or .300 Winchester Magnum. The bolt features six radial lugs that lock directly into the barrel. The barrel is protected by ventilated aluminum handguard and is fitted with muzzle brake (very useful when firing full-power magnum loads). The integrally silenced version of the DSR-1, also known as DSR-1 Subsonic, is unusual in the fact that the silencer is attached to the receiver rather than the barrel. Thus, the barrel is still free-floated within the silencer, and this guarantees consistent shot-to-shot accuracy. The trigger is two-stage, adjustable. DSR-1 features manual, ambidextrous three position safety, located above the trigger guard.
The expected accuracy of the DSR-1 is almost extreme: some sources state sub-.2 MOA accuracy (0.20 inch / 5 mm groups measured center-to-center at 100 yards) when shot by experienced operator, with correct ammunition and in good environment conditions.
The DSR-1 is fully adjustable to the shooters requirements. The rifle has an ergonomic pistol grip. The butt stock is adjustable for length of pull and butt plate position. The height of the cheek piece is adjustable via a quick release spring button. The adjustable fore-end can also be used to rest the rifle on a sandbag. All adjustments can be accomplished within seconds and without tools via quick release tension levers. In addition, the positions are calibrated for easy reference.
An extended picatinny rail for scope and accessories ( e. g. night sight attachment) is attached above the receiver and barrel cover. The rifle can be equipped with any scope required.