A full-auto pistol known as the most compact and lightweight weapon of the Grineer arsenal. Though it has a small clip size, the Viper has a very high fire rate and ultra-fast reload times thanks to a simplified magazine design.
The Viper is a machine pistol of Grineer design issued to their Shield Lancers. It is the most portable weapon manufactured by the Grineer and boasts a high rate of fire and an extremely efficient magazine reload, but poor accuracy.
The Viper was released on the 18th of March, 2013 with Update 7.
On the Viper's barrel, the word , which translates to "Viper" is inscribed in the Grineer Language. In earlier versions of the game this line of text was which translates to "Serberus", probably indicating an earlier name for the gun. The Viper's UI icon still shows a Viper with "Serberus" inscribed on it.
The Viper(s) uniquely has a distinct sound when its trigger is released. This could be a mechanism used to stop the bullet feed or to halt the cyclic action.