X-Buster

The X-Buster (エックスバスター) is Mega Man X's primary weapon in all games from the Mega Man X series. It is a Mega Buster Mark 17 created by Dr. Light alongside X. X can transform either of his arms into a powerful buster to shoot bullets of compressed solar energy, and has an energy amplifier that allows it to be charged up and release a more powerful shot.

The X-Buster also has a Variable Weapon System that allows X to use the Special Weapons of Reploids defeated by him, and it can also be powered up with different Armor Parts and Power-Up Parts. In The Day of Sigma, it's shown that X can detach his buster.

In Mega Man X: Command Mission, the X Buster was redesigned alongside X, and it is his starting weapon. X can find better versions of the X Buster during the game, the X Buster MKII and X Buster MKIII. X can also equip different types of busters. His Action Trigger is a Charge Shot.

Arm Parts
The Arm Parts obtained by X allows him to charge his buster further to use more powerful attacks. Excluding the Gaea Armor and Shadow Armor, all Arm Parts allow X to charge Special Weapons.

Appearances in other games

 * In the Mega Man Zero series, the X-Buster is one of the Ten Shining Weapons. As X only appears as a Cyber-elf in the series, his buster isn't shown, but his copy, Copy X, also has a buster.


 * In Mega Man ZX, a X Buster is Vent/Aile's primary weapon when using the Biometal Model X.


 * The X Buster also appears in the first Mega Man Legends game as an item that can be used to create the powerful Shining Laser. Its description says it is a laser weapon with batteries not included.

Rockman X manga
The X-Buster is near identical to the games, but originally it is only available in X's left arm. X can use Special Weapons by inserting chips from defeated enemy Reploids in his buster. During the battle against Sting Chameleon, his buster is severely damaged, but Armored Armadillo ordered a Metall C-15 to repair it, disobeying Sigma's orders to have an honorable one-on-one combat against X. Late in the story, X's buster is damaged again in the battle against Boomer Kuwanger in a tower, and becomes useless when he takes an energy cable from the tower and attaches it to his buster to fire a giant blast that destroyed Kuwanger and part of the tower. Without ways to attack, he's defenseless against Vile, but Zero gives his buster to X, allowing him to battle.

In the Rockman X2 manga, X gains the ability to use his buster with either arm, but he can use only one of them at a time. However, when facing the three X-Hunters in their base, he uses both busters at the same time to defeat them.

Marvel vs. Capcom: Infinite
Near the end of the game, Iron Man works to create a weapon that has the power to channel the abilities of the four Infinity Stones the heroes had. This weapon, dubbed the Infinity Buster, is given to X. X uses it to defeat Ultron Omega.

Trivia

 * In Mega Man X, X's weapon is labeled "X. Buster" in X's inventory and "X-Buster" in the epilogue. The reason for this inconsistency is unknown.