We received one of these this past week. It was necessary to fit the drum to the gun, but there were instruction from ProMag on how to do this and it was easy with a Dremel. I had to remove about 1mm of material from the shelf on both sides and then it locked up perfectly. My clients ran about 30 rounds of 00 buck and slugs through the gun today without a hiccup. It is very compact at 4.5" wide. It should look and work great with the new tri-rail that's on order. 




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