Dahl pistols are semi-automatic when fired from the hip. They fire a 2-round bursts when aiming, much faster rate than hip-fire that gives Dahl pistols the such feature as high stability when zoomed. This feature makes them a good sidearm for mid-range combat, but not as good for situations as like fight for your life.
The Repeater can come with a variety of barrels, each one can give the gun different properties:
Repeaters with stable Dahl barrel when aiming fires 4-round bursts without reducing stability and with slightly reduced recoil and damage.
Tediore barrel (standard) – Does nothing additional.
Maliwan barrel (elemental) – Increases elemental effect damage (if the weapon spawn with an element) and accuracy.
Bandit/scav barrel ("heavy") – Increases the weapon damage but reduces accuracy.
Basic Repeater – Unique (but common-quality) variant of this weapon in Borderlands 2, given as the mission reward for My First Gun.
React Repeater – Unique (but common-quality) variant of this weapon in Borderlands: The Pre-Sequel, the Wilhelm's starting weapon.
Teapot – Uniquecorrosive pistol in Borderlands 2 with a contagious elemental effect.
Hornet – Legendarycorrosive pistol in Borderlands 2 with 6-round burst when zoomed.
Gwen's Other Head – Unique pistol in Borderlands: The Pre-Sequel with 37.5% multiplicative critical hit bonus and 6-round burst when zoomed. Fires 2 projectiles at once at a cost of 2 ammo.
Blowfly – Legendarycorrosive pistol in Borderlands: The Pre-Sequel with 7-round burst when zoomed. The fired projectiles splits into two after a short distance.
The Repeater is the very first weapon a character uses in Borderlands 2.
The Repeaters with Tediore grip have a very quick reload speed and also reduced recoil. Oddly enough, such common Repeaters spawns in Borderlands 2 at green and higher rarity, making them still more rare.