I'm looking to add a magazine extender to my SIG P320's 10-round magazine (full size) without increasing the round capacity. I plan to use it with a Flux Chassis. I understand that adding an extender to a 10-round magazine will be limited by the dimple, preventing additional rounds from being added. I need a base plate that will work with the Flux. I previously bought some Strike Industries extenders, but they weren't compatible with the Flux, even though they worked on the P320.