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Agency Arms magazine extensions not only increase your magazine capacity, they are also designed with functional features that aid in one-handed manipulations. This basepad is specifically designed for 17rd magazines and is compatible with the Agency Arms X-Series Magwell and the factory magwell from SIG.
The factory replacement 17-round extended magazine for the SIG SAUER P320 9MM pistol.
Compatible with P320 9MM models in the following sizes: XFIVE, XFULL, XCARRY, FULL, CARRY.