The Q-System has the highest base damage of all three Atlas assault rifles, and the lowest base fire rate. Despite this, the Q-System's barrel will always grant it the "Cost-Effective" prefix, meaning it fires two bullets at the cost of one ammo.
With its pellet count counteracting its penalty to its low fire rate, the Q-System vastly outperforms other Atlas assault rifles through its sheer damage and low ammo consumption. It is therefore one of the few common weapons that can compete with legendaries on higher difficulties.
The Q-System can spawn with three unique barrel accessories:
A barrel guard that increases damage by 10%.
Additional pipes and parts that increases fire rate by 10%.
A cylindrical barrel accessory that increases damage by 10%, and reduces reload speed by 10%.
The Q-System is obtained randomly from any suitable loot source.