Dartling Ammo Dump

 is the Specialty Building for the Dartling Gun; it was released on July 5th. It costs 3,500 for all upgrades (5,000 in iOS).

Upgrades

 * 1) Reduces the cost of Dartling Guns and their upgrades by 5%, costs 1,000
 * 2) Increases attack speed of Dartling Guns by 10%, costs 1,000
 * 3) Dartling gunners can lock their attacks to a fixed position, costs 1,500
 * 4) (BTD5 Mobile only) All Dartling shots have +1 popping power, costs 1,500.
 * Increases the cost of Mortar Towers and their upgrades by 5%

Trivia

 * The third tier of Dartling Ammo Dump makes the Dartling Gun have the option to target a fixed position, much like how Mortar Towers target fixed positions. As such, the Focused Firing upgrade will behave much like the Increased Accuracy upgrade in this regard.
 * This upgrade pairs well when using Banana Farms, as you will not have to worry about aiming and collecting bananas at the same time.
 * The Targeting option from Tier 3 returns in BTD6 as permanent targeting option.