Double Fire

Summary
The Double Fire is a non-existing attachment that is used for the DB Shotgun. Adding this attachment onto the DB Shotgun allows you to fire two shots at once. No extra ammo is added to the shotgun reducing the amount of shots you can take from 14 to 7.

However, anybody that uses the DB Shotgun and has this attachment will say that this is worthwhile. It's one of the cheapest attachments in R2DA.

Trivia

 * This is one of the few attachments that are not visible.
 * This attachment was added in v0.7.2.