I've sectioned and welded stagger feed magazines to make them longer...don't waste your time. Use a center feed mag and notch the front to let the bullet protrude. Mill the front baffle(I'm assuming that is what you meant by "bolt shroud") as needed to lengthen bolt throw. I just bed the mag box into the stock but if you really wanted I'm sure you could use the clip that the factory uses for the center feed magazine.
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