This unit replaces the magazine base plate on the springfield xds/xde/xds mod2 in 45acp 40 s&w and 9mm single stack magazines.This extension adds one round capacity to the magazine and increases the grip length by approximately 7/8" inch.The unit also incorporates a texture that matches well with the mod 2 pattern but still feels good on the earlier frames.It also utilizes the patent pending pearcelock attachment mechanism.Caliber: 40 S&WCapacity: 1rdFinish: TexturedModel: Magazine ExtensionMaterial: PolymerModel Fit: Springfield XDS XDE XDS Mod 2Brand Fit: Springfield ArmoryCapacity: 1