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I believe the G is from the model # XDG9445FDEHCE. Perhaps it refers to Grip Zone.

The "G" on this pistol means it has the "Grip Zone" Texture. It is equipped with the new GripZone that applies ergonomic science to the areas you normally touch when gripping. The pistol also features a re-contoured, slimmer frame and slide that is only 2 tenths of an inch thicker than most single stack configurations but twice the magazine capacity.