Ammunition (or Charge) is a resource mechanic utilized by certain active effects that behaves akin to a supply of ammunition, designed around a deploy in bulk.
Stock
Effects that utilize a stock system enable activation so long as stock of it is available, which is replenished by a recharge timer. 
Cooldown reduction usually affects the recharge timer rather than the recast timer.
Champion abilities
- (Updated up to V8.15)
Aatrox's 
Umbral Dash
Ashe's Hawkshot- Azir's Arise!
- Caitlyn's Yordle Snap Trap
- Corki's Missile Barrage
- Gangplank's Powder Keg
- Graves' New Destiny
- Heimerdinger's H-28G Evolution Turret
- Ivern's Brushmaker
- Jhin's Captive Audience
- Jhin's Whisper
- Kalista's Sentinel
- Kled's Pocket Pistol
- Rumble's Electro Harpoon
- Taric's Starlight's Touch
- Teemo's Noxious Trap
- Vel'Koz's Void Rift
- Vi's Excessive Force
- Zyra's Rampant Growth
Items
- Nomad's Eye / Eye of Ascension
- Celestial Eye / Eye of the Aspect
- Eye of Frost / Eye of the Watchers
- Refillable Potion / Corrupting Potion / Hunter's Potion
- Relic Shield / Targon's Brace / Remnant of the Aspect
- Timeworn Relic Shield / Timeworn Targon's Brace / Timeworn Face of the Mountain
- Spellthief's Edge / Frostfang / Remnant of the Watchers
- Timeworn Spellthief's Edge / Timeworn Frostfang / Timeworn Frost Queen's Claim
- Warding Totem
Summoner Spells
Barrage
An ability's activation may enable successive recasts of similar or variable effects within the ability's duration. Unlike traditional stock systems, barrage casts are not periodically generated, or incur no additional resource cost.
