The weapon magazine cushion is a protective accessory for releasably fastening to a weapon magazine having a magazine base that is directed outward at the lower grip end of the weapon in the installed position and has a substantially planar magazine-base underside to which the weapon magazine cushion is fastened in a self-adhesive manner. It has a blocklike body with a flat abutment side directed toward the magazine-base underside with a rounded end face. The body is formed from an adhesive polyurethane gel material that is elastically deformable under pressure and is enclosed by a non-adhesive and protective skin, apart from on the abutment side.