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They are almost always equipped with scopes, and often have a bonus to Critical Hit Damage.
Sniper Rifles : High-damage, accurate weapons which are most effective at long range, usually with very limited magazine size and slow rates of fire.
Special assault rifles can fire grenades or rockets with standard rifle ammunition, though at a cost of multiple rounds per shot.
Sub-types include accurate, high-damage semi-auto weapons, general-purpose burst or automatic rifles, and high-capacity light machine guns with heavy recoil.
Assault Rifles : Versatile medium/long range weapon. Sub-types include single-barrel fast-firing weapons with larger magazines, medium-range weapons with low spread, and multi-barrel weapons with huge per-shot damage but slow rates of fire and frequent reloads. Shotguns : Fire multiple pellets, effective at close range but lowest accuracy of any weapon type. Usually lower per-round damage than pistols of lower level, but greater rate of fire means higher DPS, and tend to have high capacity magazines. Submachine Guns : High rate of fire and low recoil, good at close range and decent at medium range. Sub-types include auto-firing machine pistols with larger magazines but lower accuracy, middle-of-the-road repeaters, and revolvers with longer range and higher accuracy but slower reloads and lower ammo capacity. Pistols : Versatile class of weapons usually suited to short-to-medium range combat, typically with fast reload speed.
Eridian weapons have been replaced by E-tech weapons which conform to the revised six categories listed below: Revolvers and Repeaters were two distinct kinds of weapons in the original Borderlands they have since been consolidated into a single "Pistol" category.