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Russell, the 25rd Magazine will slide through but, it will be a mute point as it will be no where near the magazine well of the Pistol as it will just slide to the bottom of the magazine..

it will fit but the will be gap between the adapter and the bottom of the grip now you could drill the adapter for a set screw slide the adapter on the mag put mag into gun slide adapter up to the bottom of the grip and lock the adapter in place on the mag using the set screw you would then have the full size grip with the extra extended mag below the grip