Get the 6BR mag. I tried to make mine feed from a SF (no chance in heck there, IMHO) and a CF. The CF tried hard but was not reliable at all. I have not tried one but I have heard that the factory CF 6BR is the best way. I turned mine into a single shot.
Midway was selling the 6BR DBM mag last time I looked and had it in stock, but that was a couple weeks ago. You can just pop off the DBM floor plate and use as a blind mag, might be cashier that way but might be the only way to get one.
Hope that helps a little.
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