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Bastion magazine base plates are machined from the highest quality T6 aluminum using the highest tolerances to give you the exact fit you require, then hard coat anodized black and laser engraved, giving you the extreme durability you deserve! Compatible with Glock 9MM/.40CAL. COMPATIBLE WITH GEN 1-5. Great replacement for a plastic factory part. You will love the quality of Bastion products. Many different designs to choose from our stock inventory. We also offer custom engraving!