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.