Rival Arms Mag Baseplate Compatible With for Glock 9mm/40 S&W/357 Sig Black Anodized Aluminum (Except 36,42,43,48) The Rival Arms Mag Baseplate increases Weight at The Bottom Of Your for Glock Magazine And Aid In faster Magazine changes as Well as adding Felt Weight. It effectively reduces Felt Recoil And creates a More Balanced Firearm. The Plate Is cnc machined From Aluminum With a Hard anodized Finish. Note: This Model Is Not Compatible With for Glock 36,42,42,48 Models. Caliber: 9mm/40 S&W/357 Sig Finish: Black Anodized Model: Mag Baseplate Material: Aluminum Model Fit: for Glock Except 36,42,43,48 Brand Fit: for Glock