Chamber Gun

 is a gun. Its firing mode and appearance changes depending on which floor the player is on.

Bugs

 * For some players, firing the Chamber Gun in its Hollow mode causes a game crash.
 * If the player has Ancient Hero's Bandana, after changing modes, ammo will not be quadrupled, but maximum ammo is still quadrupled.
 * When in the R&G Dept., the gun may not switch to the pencil. Dropping the gun will change it to the pencil, but it will revert on reload.
 * May be a function of which, if any, Master Rounds are present (Tested with 2, 3 & 4).
 * If the Chamber Gun is taken into any floor where it cannot usually be taken (for example, the various character's pasts) using game modification, reloading the gun on a full clip will cause the game to crash as it has no valid form to switch to.
 * If the gun has been Duct Taped to another, the combo may be lost upon arriving in the R&G Dept.
 * If the player has the fifth Master Round and is in Bullet Hell, switching from the Forge variation to the Bullet Hell variation while firing will cause both forms to fire simultaneously, with no extra ammo cost.