The D-Series Magazines provide reliable high-capacity performance for Glock pistols and Gen 3 clones. The DS18 fits flush with 19-size frames giving shooters the versatility they need. Designed for smooth feeding and built to last the D-Series is compatible with Shield Arms magwells and engineered for those who demand performance and reliability in every round. Features: Work with Glock pistols and Gen 3 clones 18 round capacity (flush fit with 19 size frames) Heat treated to RHC 45-50 Black nitrocarburize finish Over-insertion tabs Custom high imact nylon components Compatible with Shield Arms magwells