Shadow Systems CR Mag Base Pad +1 Round Rifle Extension 1. Add this to your stock 10-round magazine to take the capacity to 11 rounds. The basepad is contoured to create a rest for your pinky. In addition to getting an extra round you will get more control over the pistol. The +1 basepad is slightly bulkier than the pinky extension. If you are looking for more control but do not want to add any bulk to the grip go with the pinky extension. The assembly goes directly on to your existing 10-round tube and does not reuse any components from other basepads (all the parts you need are included in the assembly). If you need a replacement locking pin for this basepad it is the same as the MR/DR/XR Trigger Housing Pin. Specifications for Shadow Systems CR Mag Base Pad +1 Round Rifle Extension: Manufacturer: Shadow Systems Color: Black Magazine Capacity: 1 Round Gun Make: Shadow Systems Gun Model: Shadow Systems CR920 Caliber: 9mm Luger Package Contents: Shadow Systems CR Mag Base Pad +1 Round Rifle Extension What firearm models does the manufacturer say Shadow Systems CR Mag Base Pad +1 Round Rifle Extension is compatible with? The manufacturer suggests that Shadow Systems CR Mag Base Pad +1 Round Rifle Extension is compatible with Shadow Systems CR920Shadow Systems SG9S0056P1: CR Mag Base Pad +1 Round Rifle Extension