A firearm grip, a firearm grip construction set and related methods are disclosed. An example firearm grip includes a grip portion, which includes a wall covering at least a portion of a magazine and a plurality of ribs. The firearm grip also has a first grip shell having a plurality of first lateral edges, second grip shell having a plurality of second lateral edges, and a grip back having a top edge and a bottom edge. With the example firearm grip, at least one of the first grip shell or the second grip shell is exchangeable. In addition, at least one of the first grip shell, the second grip shell or the grip back is coupled to the grip portion with an undercut tongue and groove connection. Further, at least one of the first lateral edges, the second lateral edges, the top edge or the bottom edge slidably engages under one of the plurality of ribs and an opposite edge of at least one of the first lateral edges, the second lateral edges, the top edge or the bottom edge is coupled to the grip portion via an attachment. In addition, the grip back of the example firearm grip slidably engages at least one of the first lateral edges or the second lateral edges and holds at least one of the first grip shell or the second grip shell in place.