From publisher blurb:
Become a master of fire and steel capable of both melee and short-ranged combat using explosives to enhance your melee strikes while relying on your close proximity to increase the deadliness of your point blank firearm shots. Choose to protect your allies and emphasize defense over raw power, make use of multiple gunblades to deliver rapid strikes, or specialize in two-handed weapons to deal massive damage in a single impact.
The Gunblade is a full new class for 5th edition, which provides an option for characters who wield bladed firearms, including:
3 subclasses: the Protector, Skirmisher, and Berserker
14 Infusions (special spell-like ammunition used by Gunblades)
8 new Bladed Firearm weapons
10 new types of crafted magical ammunition for firearms