Viper

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.

This weapon can be sold for.

Characteristics
Advantages
 * A polarity slot.
 * Great rate of fire.
 * Reloads very quickly.
 * Decent damage per bullet.
 * Good for short range, and medium range if using small bursts.
 * High critical chance.

Disadvantages
 * Small magazine size.
 * Drains ammo very fast (approximately 1.2 second).
 * Not suited for long range fights.

Acquisition
The Viper can be purchased for  and the blueprint for .

Weapon Loadouts
See the user build section for builds using this weapon.

Tips

 * Some have experienced bugs with this weapon's reloading. Try and stop pressing the sprint button while you reload. For some reason if you reload and sprint at the same time you might have some problems with fast reloading weapons. NOTE: This reloading glitch can be caused by game lag and low framerates, and can become so troublesome you can stand in place and it will constantly do the reload animation indefinitely or until lag improves. It is not recommended to use this weapon if you have problems with lag or framerate issues as this may become near usless in combat.
 * Although it is not recommended for long range fighting, correctly aiming and tapping the trigger will expel 1-2 bullets at once, and you may get a decent critical or headshot rate by doing this.
 * Using the Pistol Ammo Mutation mod can help regain lost ammo when needed. Alternatively, use Pistol Scavenger aura or bring along Team Ammo Restore.

Trivia

 * The Viper was released on the 18th of March, 2013 with Update 7.
 * Has "Serberus" inscription written in Grineer language.
 * 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.
 * As a full-auto pistol, the Viper may be referred to as a machine pistol.
 * Grineer Shield Lancers still fire their Vipers in bursts of three, despite not using the Sicarus.