Put a Empire Katana mag well on my Wilson Combat 365XL frame.
The factory 12rounders just need a hair more thickness to seat quickly on mag changes.
See all kind of finger extensions, but just need about 1/8 to 1/4 thickness.

Any out there or should i just glue some material on?

Apparently Empire couldn't find any either, so they are making their own.
Of course, out of stock.