|This article is about a/an weapon in Kamen Rider Build.|
The Ultimate Power Change Fullbottle Buster (究極豪成 フルボトルバスター Kyūkyoku Gō Sei Furubotoru Basutā) is the personal weapon of Kamen Rider Build's RabbitRabbit and TankTank Forms. He can also wield it in his Genius Form as well.
The FullBottle Buster consists of the following parts:
- Crash Site Wrench (クラッシュサイトレンチ Kurasshu Saito Renchi): An aiming sensor located on top of the blade. Not only is it used to help correct the user's aim during attack, but it can also be used to pinch, and possibly peel off the enemy's armor.
- FB Buster Blade (FBバスターブレード Efu Bī Basutā Burēdo): The slashing unit of the FullBottle Buster in Blade Mode. This is said to be able to cut through a Guardian Union, and has a chainsaw built into it for a boost in attack.
- Full Blade Grip (フルブレイグリップ Furu Burei Gurippu): The grip of the weapon, not only can it be used to optimize attacks by recording and analyzing the user's habits and the enemy's behavior, but it can also be used to hit nearby enemies with its hammer-like end.
- Full Assist Grip (フルアシストグリップ Furu Ashisuto Gurippu): A secondary grip located at the back of the muzzle. It's job is also to suppress recoil during shooting attacks, and raising the hit rate.
- Full Bottle Releaser (フルボトルリリーサー Furu Botoru Rirīsā): A red button used to discharge and release fullbottles.
- FB Buster Cannon (FBバスターキャノン Efu Bī Basutā Kyanon): The bombardment unit of the FullBottle Buster in Cannon Mode. Not only can it emit a heavy light and energy grenade that can erase the target, but it can also be customized according to the situation by adjusting the fire resistance, explosive power, caliber, etc.
- Quad Full Bottle Cylinder (クアッドフルボトルシリンダー Kuaddo Furu Botoru Shirindā): A long channel that can hold up to four FullBottles at the same time for special attacks. The contents of the bottles are taken into the weapon, and activates a deathblow with the strength depending on how many bottles are loaded.
- Select Lancer (セレクトランサー Serekuto Ransā): A hinge for switching between blade and cannon modes that can be rotated simply by holding a button.
- Break Match Trigger (ブレイクマッチトリガー Bureiku Matchi Torigā): The trigger of the weapon. When FullBottles are loaded, and the trigger is pulled, the deathblow will be initiated.
The Fullbottle Buster was designed by Sento along with the FullFull RabbitTank Bottle.
This weapon has two modes: the sword-like Buster Blade Mode (バスターブレードモード Basutā Burēdo Mōdo) and the pump-action shotgun-like Buster Cannon Mode (バスターキャノンモード Basutā Kyanon Mōdo).
By inserting up to four Fullbottles into the weapon's Quad Full Bottle Cylinder, it can activate special finishing moves:
- Fullbottle Break (フルボトルブレイク Furubotoru Bureiku): Activated by inserting a single Fullbottle into the Fullbottle Buster.
- Gold Rabbit: Build delivers a powerful golden slash.
- Rabbit: Build fires a ball of red energy at the enemy.
- Spider: Build fires a blast of purple energy that transforms into a web to trap the target.
- Magnet: Build fires a blue energy magnet that pulls enemies towards each other to the point where they implode.
- Dryer: Build fires a ball of red energy that transforms into a stream of heat which continuously burns the target.
- Just Match Break (ジャストマッチブレイク Jasuto Matchi Bureiku): Activated by inserting two Fullbottles into the Fullbottle Buster.
- Gold Rabbit + Silver Dragon: Build coats the Fullbottle Buster in gold and silver energy before running at the enemy, jumping above it, and slashing both downward and horizontal.
- Rabbit + Panda: Build fires a ball of red and white energy mixed together.
- Rocket + Jet: Build fires a ball of cyan energy that flies at high speeds.
- Miracle Match Break (ミラクルマッチブレイク Mirakuru Matchi Bureiku): Activated by inserting three Fullbottles into the Fullbottle Buster.
- Buster Cannon Mode:
- Rabbit + Panda + Taka: Build fires a ball of red and white energy mixed together that gives off orange energy shockwaves upon impact.
- Buster Cannon Mode:
- Ultimate Match Break (アルティメットマッチブレイク Arutimetto Macchi Bureiku): Activated by inserting four Fullbottles into the Fullbottle Buster.
- Buster Cannon Mode:
- Tank + Jet + Gatling + Rocket: Build fires a ball of blue, gray, and white energy with the images on Bottles mixed together that gives off cyan energy shockwaves upon impact.
- Buster Cannon Mode:
- FullFull Match Break (フルフルマッチブレイク Furu Furu Matchi Bureiku): Activated by inserting the FullFull RabbitTank Bottle into the Fullbottle Buster.
- Rabbit Mode: Build delivers a slash with the blade covered in red energy.
- Genius Form: Build unleashes a green energy slash that travels through the air.
This finisher has two variations:
- Build's lower body transforms into a pair of tank treads, the cannons on his shoulder armor flip forward, and Build rolls around the battlefield while continuously shooting his target target, ending the barrage with a large blast of energy that gives off blue electricity.
- Build fires a blue energy ball that creates shockwaves upon impact.
- Zi-O, as GrandZi-O, fires a blue energy ball that explodes immediately upon impact.
Build fires a rainbow energy ball that creates shockwaves upon impact.
- Interestingly, while Build's other weapons are announced by the voice of the Build Driver when summoned, in the Fullbottle Buster's first use in battle Sento announces its name himself. However, in subsequent appearances, it is announced by the Build Driver.
- The Fullbottle Buster shares aspects with its predecessor super form weapon, the Trailer-Hou; It is a large cannon that loads multiple collectible devices to activate a finisher like the Trailer-Hou. "FullFull" is also a phrase shared with the Trailer-Hou.
- In addition, to activate the Final Form's version of the super form weapon's finisher, both Drive and Build must load the transformation trinket that grants them their form.
- Uniquely, it has finishers using more than just two trinkets at once.
- The Fullbottle Buster's hilt noticeably resembles the Hazard Trigger.
- It has some parallels to the Hinawadaidai-DJ-Ju from Kamen Rider Gaim:
- Both possess gun and sword modes with second grips.
- Similar to the Soujintou Mode, it possesses features available from the start (two hidden finisher announcements), but required inspection of the toy to achieve it (disassembling the Genius Fullbottle for the pin combination).
- Much like the Soujintou Mode, the aforementioned features were never shown in the main story.
- Although only informed within the official website, an actual Castle Lost Smash is said to have the firing strength equal to the Fullbottle Buster.