Break Gunner

"(Heavy Metal-based standby music) Break Up! (End riff-based Heavy Metal music)"

- Transformation announcement

"Gun!"

- Gun Mode announcement

"Break!"

- Break Mode announcement

"Tune: (Viral Core/Shift Car)!"

- Tune Up announcement

"Execution! Full Break: (Viral Core/Shift Car)!"

- Finisher announcement

The Break Gunner (ブレイクガンナー) is a device used by Chase to transform into the Kamen Rider-like warrior, Mashin Chaser. It also doubles as his main weapon of choice.

Functionality
To transform, the user firmly holds the Hard Gear Grip (ハード ギア グリップ) and slams their hand on the Destruction Muzzle (ディストラクション マズル) spring-like button, holds it for a few seconds, then lets go and aims the Break Gunner above their head, causing the device to announce "Break Up" (ブレイクアップ) while a series of shadow tires and electricity projects out of it to surround the user and combine with the user's body, thus ending the transformation sequence into Mashin Chaser.

By pressing and releasing the Destruction Muzzle, Mashin Chaser can also activate the Break Gunner's Gun Mode. Pressing the Destruction Muzzle once again activates its Break Mode as well. It also allows him to use the Break Gunner as a knuckle duster with the small spikes below the Destruction Muzzle called Revenger Pikes (リベンジャーパイク) empowering the blow.

Since the Break Gunner was based on Proto-Drive's equipment (presumably his own Shift Brace), the user can "Tune" (チューン) up using either a Shift Car or a Viral Core's powers by inserting them into a slot called the Viral Landing Panel (バイラルランディングパネル) behind the Guard Wingle (ガードウィングル), a purple spoiler. Using a Shift Car will simply add its power to the Break Gunner, which is activated by pulling the Demolition Trigger (デモリッショントリガー), while using a Chaser Viral Core will allow the user to transform into the appropriate Tune Chaser form.

To initiate a finishing attack, Mashin Chaser must first assume a Tune Chaser form before pressing the Destruction Muzzle, which makes the Break Gunner announce "Execution" (エグゼキューション). Pulling the Demolition Trigger afterwards would then give Mashin Chaser an exceeding amount of power, as well as cause the Break Gunner to announce "Full Break" (フルブレイク) and then the corresponding Viral Core used. Mashin Chaser may now release the power gained in any way he wishes.

In episode 21, after upgrades made by Medic, Mashin Chaser can create an improved version of Heavy Acceleration simply by absorbing energies in his Break Gunner and punching it into the ground, producing a purple wave that affect a small area in a certain radius. The effect is more powerful than the original Heaviness, as it manages to slow down Drive Type Wild despite him having the necessities used to counter Heavy Accelerations. However, the effect can be countered through the use of Shift Deadheat, but it still restricts the Shift Car/Signal Bike hybrid's enhanced combat capabilities.

Other versions

 * Kamen Rider Lupin uses a gold-colored version of the Break Gunner called the Lupin Gunner (ルパンガンナー) as his transformation device, which has an additional Blade Mode (ブレードモード) that is accessed via the Lupin Blade Viral Core.