A concealable rifle that can be compacted into a staff and can be used as a bludgeon for 1d8 bludgeoning damage. When transformed, the rifle does 3d6 fire damage. A detachable scope gives advantage on attacks over 100m and disadvantage within 100m.
It’s up to you to decide whether a character has proficiency with a firearm. Characters in most D&D worlds wouldn’t have such proficiency. During their downtime, characters can use the training rules in the Player’s Handbook to acquire proficiency, assuming that they have enough ammunition to keep the weapons working while mastering their use.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Slow. If you hit a creature with this weapon and deal damage to it, you can reduce its Speed by 10 feet until the start of your next turn. If the creature is hit more than once by weapons that have this property, the Speed reduction doesn’t exceed 10 feet.
Notes: Damage: Fire, Damage: Bludgeoning, Damage, Combat, Range, Two-Handed, Ammunition (Firearms), Reload, Slow