If you can lay one side by side with the Pmag. Look to see where the mag lock hole is. See if it is in the same place as your PMag, it sounds to me like they may be a little lower causeing the magazine to have to be pushed up further into the gun. if it is that way you may be able to take a dremel and fix it, or you may want to do as Mr. Moore said and peddle them off. I would myself see if I could fix it with a file or dremel. But compare and see if that is where your problem lies.

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Grover Oathkeeper