GK, you could always do what I did and get a chambered barrel from MAB in 404 Jeffery and the cost of a reamer is not on the table. I built mine on a 52 FN Colombian and used the mag with a few modifications, some of which you can do yourself even with handtools. EX Mil follower used and functions flawlessly. Sides of mag milled and rails re-shaped. Performance is excellent andf the only thing I would change if I did it again would be to use a lighter profiled barrel using a no 5 instead of the no 7.

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Von Gruff.