Obsidian Arms Sig Sauer P320 Retainer Plate Square Peg Black. They can be used with either SIG SAUER or Obsidian Arms base pads if the originals have become lost or broken. Specifications for Obsidian Arms Sig Sauer P320 Retainer Plate Round Peg: Manufacturer: Obsidian Arms Color: Black Finish: Hard Coat Anodizing Fabric/Material: 6061 Aluminum Gun Make: SIG Sauer Gun Model: SIG Sauer P320 Country of Origin: USA Features of Obsidian Arms Sig Sauer P320 Retainer Plate Replacement for factory retainer plates that are lost or broken. Fits full carry or compact size Sig Sauer P320 pistol magazines. Suitable for 9 / 40 / 357 SIG Made from 6061 Aluminum Hard Coat Anodizing Package Contents: Obsidian Arms Sig Sauer P320 Retainer Plate What firearm models does the manufacturer say Obsidian Arms Sig Sauer P320 Retainer Plate Round Peg is compatible with? The manufacturer suggests that Obsidian Arms Sig Sauer P320 Retainer Plate Round Peg is compatible with SIG Sauer P320Obsidian Arms OA-P320-RP-SP: Sig Sauer P320 Retainer Plate Square Peg Black