Returner

 is a Tier 5 Tank that upgrades from Boomer and Mailman at level 60.

Design
The has a similar base to Boomer, but its remaining two barrels are modified to look like Mailman. The barrel immediately above the base tapers outward slightly like Mailman's, and its tip barrel is the same width at its base but tapers back inward. All of the barrels are noticeably wider than Boomer's.

Its boomerangs have 5 very small decorative trap toppers on top of them.

Technical
The is the Boomer variant of Mailman. Its boomerangs explode into an even radial burst of 5 traps when they expire.