I dunno about the model you have, but all the MEC 600 and Sizemaster models appear to have what is called a "Pro Check" that is fastened to the charge bar with a screw and the hole that the screw threads into in on the front side of the charge bar on all models as far as I know. At least that is true of the Sizemaster. So if you have a pro check on yours I cannot understand how it could be assembled with the shot drop beneath the powder bottle.
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