Compound

 is a Tier 5 Tank that upgrades from Hotshot, Archer and Carbine at level 60.

Design
The looks similar to the Archer but it becomes the width of Carbine.

Technical
The is simply a fusion of Hotshot and Archer, or a Minigun variant of Carbine.

Trivia

 * While it may not initially seem to fit the bow-themed naming of Archer branch, a compound bow is a type of bow made specifically for powerful shots. It also contains "pound", in reference to the tank's Hotshot lineage.