Heavy Caliber

Heavy Caliber increases damage of Rifles at the cost of reduced accuracy.

Trivia

 * When it was first released, Heavy Caliber increased recoil as well as damage. However the recoil penalty did not affect recoil-less weapons (Flux Rifle, Ignis, Synapse, Paris, Lanka, among others), effectively acting as another instance of Serration. This was confirmed to be unintentional in Warframe Prime Time - Episode 2 (9:40). The mod's effects were changed Update 10.4: it now gives an accuracy penalty instead of a recoil penalty.