The MSG-90 was designed in 1987 as the military version of the H&K PSG1 (both descendants of the H&K G3). MSG stands for Militärisches Scharfschützen Gewehr, which translates to Military Sharpshooter Rifle.
The MSG-90 shares most of the essential features of the PSG-1, including overall design, the roller-delayed blowback, and semi-automatic only action. The barrel of the MSG-90 is somewhat shorter and lighter, but still is of match grade, free-floating and is manufactured using cold hammer forging process. On the original model the barrel is equipped with additional muzzle weight, added to improve barrel harmonics and thus increase shots consistence. The barrel of the MSG-90A1 is threaded and capable of attaching a suppressor, which is an advantage over the PSG-1.
The MSG-90's buttstock is of different shape, adjustable for the length of the pull and for the height of the cheekpiece. The trigger unit is made from plastic integral with a pistol grip. The trigger, with an adjustable shoe, is set at 1.5 kg. The forend is fitted with an underrail that accepts the detachable folding bipod. There are no open sights on the MSG-90, and it is fitted with a 10X telescope sight with range settings from 100 to 1200 meters. The scope is mounted on the MilStd scope rail, that allows for many various scopes and night vision devices to be mounted interchangeably. The MSG-90 is a bit cheaper than the PSG-1.