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Oh those are different from trimming the magwell. If you notice in the picture, there are 4 holes near the top of the magwell. From the factory there is a gasket there that fits the ribs on a Stanag magazine. It’s actually designed to be able to be popped out with a thin screw driver. Doing so ruins the gasket but you can reorder it. The magwell itself has no ribs, it’s just so tight that ribs on aftermarket mags won’t fit.