No, no such thing that I'm aware of. When they were first imported the mag well could only except a single stack 10 rounder hence the 10/ IN 10/63. Century monkeys opened up the mag wells with tin snips and welded two ears up inside to except double stacks in 2004 after the scary features bill expired. If you'll notice a metal 30 rounder will wobble like crazy. Will still run like a champ though.
P.S
Watch running your fingers inside that receiver. ALL those edges are razor sharp. Take a stone or file or even sandpaper to the edges. Your fingers will thank you.