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Bottle Change Rider Series (ボトルチェンジライダーシリーズ,Botoru Chenji Raidā Shirīzu, abbreviated to BCR) is a toyline series of action figures attached to Kamen Rider Build. Best Match Figures are designed to split in two to recreate Trial Forms, while other figures their own gimmicks: SclashDriverusers feature flip-out armour parts to replicate their transformations, RabbitTank Hazard features attachable armor parts to turn it into either RabbitRabbit or TankTank Form, and Genius Form has a chestpiece that can be rotated to change its color.