Egg Firing involves Banjo crouching down while Kazooie shoots a Blue Egg forward. Similarly to projectile moves such as Mario's Fireball, the trajectory of the eggs fired during Egg Firing is affected by gravity. Eggs are weak projectiles that cause flinching. When using Egg Firing in midair, Banjo & Kazooie's falling speed is briefly reduced.
When the special button is held, the pair transitions into the Breegull Blaster (タマゴばきゅーん, Egg Kaboom). Holding or mashing the attack or special buttons (or the C-Stick) during Breegull Blaster causes Kazooie to fire eggs at twice the firing rate of Egg Firing; Banjo can still walk and jump while Breegull Blaster is active. The eggs fired from Breegull Blaster deal less damage than the ones from Egg Firing (with repeated uses of Breegull Blaster causing the eggs to deal even less damage), they have shorter range, and they only move directly forward, but they move more quickly, and have vertical knockback at point-blank range that grant them limited combo potential. Breegull Blaster can be canceled via shielding, crouching, grabbing or performing the side, up or down special inputs.
When Kirby uses the move, he uses an animated Kazooie plush instead of the real Kazooie.
Blue Eggs are introduced in Mumbo's Mountain of Banjo-Kazooie as the duo's sole projectile attack. With Banjo crouching, Kazooie can fire up to three eggs at a time in a straight line forward, or in a bouncy pattern backward. Eggs are often fed into holes or other suspicious objects to solve puzzles, while they deal low damage to enemies. Banjo-Tooie allows Kazooie to fire eggs in any direction across an infinite distance using first-person aiming, including while flying or swimming underwater, and also introduces other sorts of ammo types such as Grenade Eggs. Kazooie can carry up to 100 Blue Eggs at a time, though Cheato can double this limit.
The Breegull Blaster is taught in Banjo-Tooie's Mayahem Temple. Upon entering certain areas, Banjo automatically wields Kazooie like a shotgun, turning the game into a first-person shooter reminiscent of Rare's earlier title GoldenEye. Kazooie can fire eggs continuously in this mode. The game includes a multiplayer mode where four players can fight in the game's FPS arenas, playing as different characters with their own unique egg-shooting birds.
Breegull Blaster also appears in Banjo-Kazooie: Grunty's Revenge, wherein Banjo can perform it anywhere after learning it from Bozzeye, replacing the normal egg shooting.