The Radian Magazine Base Pad is a direct replacement part for the Shield Arms S15 GEN1-3 magazines. The Radian base pad adds weight to the bottom of the magazine which aids in dropping empty magazines. A larger grip surface allows users to index spare magazines from holsters for quicker reloads whiles also being able to easily extract a stuck magazine. Sold in a set of two. *Magazines not included. Compatibility:Shield Arms S15 Magazines Gen1-3