FEATURES Pearce's Plus Extension grip for the Glock 42 replaces the magazine floor plate providing one extra round of capacity. It is approximately 3/4" additional gripping surface for better control and comfort while also incorporating the factory texture pattern. A magazine extension grip for the Glock 42 (380 cal). This extension replaces the magazine floor plate providing one extra round of capacity and approximately 3/4 inches additional gripping surface for better control and comfort while also incorporating the factory texture pattern.