A firearm handgun grip portion invention that includes the handgun grip portion of a handgun frame with a forward grip portion and a rear grip portion with the rear grip portion having connecting means for removably connecting a plurality of removable and replaceable grip portions to the rear grip portion of the handgun frame. The removable and replaceable grip portions are connected to and removed from the handgun grip portion of a handgun frame through a sliding motion with a projecting rib portion on the handgun grip portion sliding into and out of slots located in the removable and replaceable grip portions. Portions of the removable and replaceable grip portions are retained in a well to prevent them from spreading under pressure. The removable and replaceable grip portions have different configurations including grip portions with different sizes and different shapes, including the shape of another type of handgun such as the well known Model 1911 pistol.