Zheleza roughly translates to "Lord of Iron" in the language of ancient Kunistrya

The iron stock of this lever action rifle can open and produce a variety of tools; as an action, you can open the slot and produce any type of artisan's tool of your choice (see the "Equipment" chapter in the Player's Handbook for a list of artisan's tools). Whatever tool you produce, you are proficient with it.

While holding this rifle, you gain a +2 bonus to the spell attack rolls and the saving throw DCs of your artificer spells. You can also use this rifle as a spellcasting focus for your Artificer spells. 

As an action, you can focus on the rifle to channel your creative forces. Choose a cantrip that you don't know from any class list. For 8 hours, you can cast that cantrip, and it counts as an artificer cantrip for you. Once this property is used, it can't be used again until the next dawn.

Additionally, when you cast a cantrip from this rifle that deals damage, you can cause that damage to empower itself beyond its normal means. When you do so, you roll the damage dice of that cantrip twice. You can do this a three times per dawn. You must decide to do this before damage is rolled but after the attack hits.

Notes: Bonus: Spell Attacks, Bonus: Spell Save DC, artificer