Transteam Gun

The Transformation Smoke Pistol Transteam Gun (変身煙銃トランスチームガン) is the personal weapon and transformation device of Night Rogue and Blood Stalk. It combines with the Steam Blade to form the Steam Rifle (スチームライフル).

Although created by Takumi Katsuragi alongside the Rider System (Build Driver), the Transteam Gun (represented as Transteam System (トランスチームシステム)) does not increase the user's Hazard Level (which when raised, can increase the power of the user). Hence, Transteam system users rely solely on their own skill, ability, and experience in fights.

The schematics for the Transteam Gun and its abilities are detailed in the 2nd file of Project Build.

Transformation
Fullbottles are loaded into the Transteam Gun to transform. Night Rogue uses the Bat Fullbottle to transform, and Blood Stalk uses the Cobra Fullbottle. The transformation command is "Jouketsu" (蒸血). According to Gentoku Himuro, to use the Transteam Gun, the user needs to raise their Hazard Level first to a suitably high level, albeit not as high as the Build Driver requirement.

Finisher
The Transtream Gun has 2 shooting finishers: Steam Break (スチームブレイク) with a Faust Fullbottle and Steam Attack (スチームアタック) with a normal Fullbottle.

As the Steam Rifle, its shooting finishers are Steam Shot (スチームショット) with a Faust Fullbottle and Steam Attack with a normal Fullbottle. Steam Break=
 * Bat:
 * Cobra: Blood Stalk shoots a purple cobra energy blast that detonates upon impact.