1) Remove factory basepad and retainer plate. To add NO ADDITIONAL CAPACITY to the magazine skip to step 3
2)
Remove magazine spring and slide factory follower down to base of
magazine so that the load assist pin can be removed from the follower.
3)
Compress spring into magazine body and slide on the aluminum basepad.
Assure that the spring is in the pocket of the basepad.
4) Finger tighten set screw with the included hex wrench.
High Capacity 22lr Magazine Instructions
* Due to the nature of this item and international regulations (ITAR) we can not sell to anyone that is not in the United States. All international orders will be canceled. To place an international order, the order must be placed through an exporter. Contact an exporter HERE
** This item CAN NOT be shipped to California
*** Verify your local and state laws for any restrictions before installing these parts. It is the users responsibility to verify any legal conflict with the use of these parts.
Mag basepad 
Excellent product but