Disclosed are various embodiments for a knife configured to be positioned, at least partially, within a grip of a firearm. The knife may include a blade body having a first blade side and a second blade side. The blade body may include a base and a knife edge portion. The knife may further include a handle portion. The handle portion may include the base of the blade body, a first handle attachment coupled to the base on the first blade side, and a second handle attachment coupled to the base on the second blade side. The knife may include an attachment mechanism for positioning at least the knife edge portion within an interior of the grip of the firearm.