The Shadow Systems Subcompact Magazine pinky extension gives significantly more purchase on the grip for your firing hand and adds very minimal size to the overall gun The 10-Round Pinky Extension for the CR920 fits standard 10 and 13-round magazine tubes. When adding the pinky extension to an existing 10-round magazine you may use the locking plate that is already in your 10-round magazine. If adding the pinky extension to an existing 13-round magazine use the locking plate that ships with this part. PLEASE NOTE THIS BASEPAD DOES NOT INCREASE CAPACITY ROUNDS.