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Bloons Wiki

Two guns for twice the fun.
~ In-game description

Double Gun is the 3rd upgrade of Path 3 for the Engineer Monkey in Bloons TD 6. It doubles the Engineer's nailgun's attack speed from ~1.429 attacks per second to ~2.857 attacks per second (decreases attack cooldown from 0.7s to 0.35s), with nails alternating between its two nailguns. The increased attack speed does not affect its sentries (via Sentry Gun and above) or the rate of deploying sentries.

This upgrade costs $380 on Easy, $450 on Medium, $485 on Hard, and $540 on Impoppable.



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Double Gun

Double Gun sports double guns, each with red lining the end of the barrel, as well as a pair of red earmuffs and golden goggles.

Crosspathing with Path 1 paints the nail guns green, adds a wrench to its back, and then paints said wrench's handle red.

Crosspathing with Path 2 gives it an orange cap with a yellow pencil before swapping it out for a red cap with a white pencil with blue lead and a pink eraser.

Double Gun has all the functionality of Pin with double nail gun attack speed, for an attack cooldown of 0.35 seconds. Double Gun utilizes Alternating Shots (unspecified variants and style of alternating separate shots) Alternating Weapons to shoot from each gun, alternating between left and right guns.

Targeting Priorities[]

Double Gun targets bloons using the standard targeting priorities. Its main attack shoots straight movement projectiles.

  • First: Targets the first bloon visible within its range.
  • Last: Targets the last bloon visible within its range.
  • Close: Targets the closest bloon visible within its range.
  • Strong: Targets the strongest bloon visible within its range.


Updated as of Version 43.0. Listed prices exclude external buffs, any sacrifices, and Monkey Knowledge.
[Module | Data] Purchase Sell
Costs Easy Medium Hard Impoppable Easy Medium Hard Impoppable
Upgrade (X-X-3) $380 $450 $485 $540 -
Total (0-0-3) $1,240 $1,470 $1,585 $1,765 $868 $1,029 $1,110 $1,236
Crosspath (1-0-3) $1,665 $1,970 $2,125 $2,365 $1,166 $1,379 $1,488 $1,656
Crosspath (2-0-3) $2,005 $2,370 $2,555 $2,845 $1,404 $1,659 $1,789 $1,992
Crosspath (0-1-3) $1,450 $1,720 $1,855 $2,065 $1,015 $1,204 $1,299 $1,446
Crosspath (0-2-3) $1,745 $2,070 $2,235 $2,485 $1,222 $1,449 $1,565 $1,740

This upgrade's prices (or included crosspath's prices) are affected by the following MK: BetterSellDealsIcon Better Sell Deals



Double Gun is an excellent solo for the early-game due its high pierce, decent attack speed, and the power to reduce bloon progress via the Pin effect. Again, the Double Gun Engineer does the best along straightaways to maximize its pierce.


  • Generally speaking, a 2-0-3 Double Gun is better than a 0-2-3 Double Gun. The sentries have 3 pierce per shot due to the benefits of Oversize Nails crosspath with sentries, and they will deal overall more damage all-round compared to the benefits of longer range and the extra MOAB damage and Fortified damage from the Path 2 upgrades. However, 0-2-3 Double Gun is far cheaper, and works better along straight lines.
  • This upgrade is a helpful early-game tower for general speed reduction of bloons for a rather low price.
  • On CHIMPS, this upgrade can be useful on Geared for the early-game.

Version History[]

Balance Changes[]

Besides crosspathing changes to Oversize Nails, Double Gun has been relatively unchanged. It did receive a price buff that did improve its early-game.

While better than many options, base Engineer still takes a lot of available starting cash so the cost is reduced slightly and being moved back up into Cleansing Foam & Bloontrap; also with a reduction to Double Gun’s price to reflect the lower value of the base tower. [...]
~ Ninja Kiwi
  • BUFF Double Gun cost reduced from $500 to $450
    • Total price adjustment is -$100 due to base Engineer Monkey (-$50)

Bug Fixes and General Changes[]

Extra Notes (Version History)[]


Official artwork[]


  • This upgrade was memed by the community, being featured in "Don't mess with my son ever again!" memes due to its design being similar to the Robo-Monkey.
    • Pat Fusty and the Dart Monkey have also been included in such memes due to Pat resembling an oversized version of a Dart Monkey.
    • Although the design and attributes are similar, the Double Gun Engineer has a slower fire rate than Robo-Monkey, but is still effective at popping Bloons.
  • Two 0-1-3 Engineers can beat up to 25 Rainbow Bloons, or 6 Ceramic Bloons on Logs. (Tested in Hard Sandbox with 5 spacing; they can beat 26-28 with some life loss and maybe 26 NLL with some RNG) 3 are required to beat a MOAB.
  • The concept of the Double Gun upgrade is likely a reference to the Engineer from Team Fortress 2, specifically from the Meet the Engineer trailer where Engineer tells the viewers that he solves practical problems regarding self-protection with "more gun": "The answer? Use a gun. And if that don't work, use more gun."
  • Double Gun has the second-lowest XP requirements for a Tier 3 upgrade for the upgrade alone, second to Druid of Wrath.