Abstract: A magazine well grip is configured to be self-retained on the front portion of the magazine well of the lower receiver for an AR type rifle or pistol. The magazine well grip includes a body that generally tapers outward from top to bottom, and includes a rib on an inner surface to contact the magazine well and maintain space between the magazine well and the inner surface of the magazine well grip. At least some of the ribs include an integrally formed retaining feature for engaging the lip of the magazine well which, in conjunction with a retaining tang that protrudes from the top of the body to engage a hinge pin boss, operates to retain the magazine well grip on the magazine well.