MSG-90

Heckler & Koch designed the MSG90 in 1987 as a militarized derivative of the PSG1 precision rifle. While the earlier PSG1 was developed following the 1972 Munich massacre for law enforcement applications, the MSG90 was intended to provide a lighter and more durable alternative for military use. The design sought to reduce production costs while maintaining the accuracy requirements for a designated marksman or sniper role. Production of the rifle commenced in 1990 and continued until 2021.

The MSG90 utilizes a roller-delayed blowback operating system, mechanically based on the Heckler & Koch G3 battle rifle. It features a 600 mm free-floating, contoured barrel that is weighted at the muzzle to provide harmonic stabilization and consistent barrel whip. The rifle is equipped with a composite shoulder stock adjustable for both cheek height and length of pull. Its trigger mechanism is a modified version of the push-pin trigger packs used in Heckler & Koch select-fire rifles. Unlike the PSG1, the MSG90 employs a multipurpose Weaver rail system for mounting optics and includes a barrel-mounted flash suppressor.

The rifle entered service in 1990 and has been adopted by various military and law enforcement organizations. Notable variants include the MSG90A1, which features a threaded barrel with a bird cage flash hider to support suppressors and other muzzle attachments, and the MSG90A2. Regional variants include the Mexican MSG90SDN and the Pakistani PSR-90, the latter produced under license by Pakistan Ordnance Factories. The rifle is utilized by units such as the French Army's 1st Marine Infantry Parachute Regiment, the Norwegian Army Special Forces Command (HJK), the Lithuanian Armed Forces, and the United States FBI Hostage Rescue Team. Other operators include special operations groups in Indonesia, Malaysia, South Korea, and Turkey.