AGENCY MAG EXT SIG P320 17RD +5 BLKThe Agency Arms Magazine Extension for SIG P320 17 round magazines in black adds 5 rounds to your standard capacity, boosting your total to 22 rounds. This extension is precision machined from high grade aluminum with a sleek black finish that complements your SIG P320's aesthetics. It includes a high quality spring to ensure reliable feeding and function with the increased capacity. The extension's design maintains a low profile while providing an