The MSG-90 sniper rifle had been introduced by the German company Heckler-Koch in 1987 as a militarized offspring of their PSG-1 police sniper rifle. It was built to military specifications, and is much lighter and somewhat cheaper than the H&K PSG-1. It shares most essential features of the PSG-1, including overall design, the roller-delayed blowback and semi-automatic only action.
The latest variant is the MSG-90A1. This rifle was built for US DOD DMR (Designated Marksman Rifle) program, and has some additional characteristics and features, not found on the original MSG-90. The MSG-90A1 is fitted with the barrel, threaded on the muzzle, to accept screw-on silencers, and is equipped with low signature flash hider. The MSG-90A1 also is equipped with open sights - a typical HK hooded front sight, combined with adjustable rear sights, similar in design to HK 21 Machinegun rear sight. The ejection port is fitted with brass deflector, which allows the gun to be fired from the left shoulder. Otherwise it is similar to the MSG-90.
MSG90A1 Military Sniper Rifle
 
       
  The barrel of the MSG-90 is somewhat shorter and lighter, but still is of match grade, 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 buttstock is of different shape, adjustable for length of pull and for height of the cheekpiece. The trigger unit is made from plastic integral with pistol grip. The trigger with adjustable shoe is set at 1.5 kg (~3 lbs). The forend is fitted with underrail that accepts the detachable folding bipod. There's no open sights on the MSG-90, and it's fitted by standard with 10X (6X in game) 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.

-(Shortened and/or modified version of the article at world.guns.ru)

 
MSG90A1 uses GETME magazines like all in the G3 family
       
  GAME DATA: MSG90A1

The MSG90A1 is a very accurate rifle. Not many people have access to it. So if you want one, get it before leaving to a mission. You most likely won't find it in the field. 6X scope and high accuracy will make sure you scope a hit every time.

   
Name: MSG90A1  
Slot: 5, rifles  
Caliber: .308 Winchester  
Capacity: 20 rounds  
Firemodes: Semi-auto  
Accuracy: Perfect  
Other: 6X sniper scope  
   
   
 
MSG90A1s scope removed

.