Shadow Systems CR Mag Pinky 0 Round Rifle Magazine Extension 0. The 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. Specifications for Shadow Systems CR Mag Pinky 0 Round Rifle Magazine Extension: Manufacturer: Shadow Systems Color: Black Magazine Capacity: 0 Round Gun Make: Shadow Systems Package Contents: Shadow Systems CR Mag Pinky 0 Round Rifle Magazine Extension Shadow Systems SG9S0056PKY: CR Mag Pinky 0 Round Rifle Magazine Extension