Magazine quality/consistency seems to be a problem with both the A and B-Series rifles that use the rotary mag. Another thing that tends to cause problems is the mag hanger molded into the stock. Don't know if it's inconsistency from mold cavity to mold cavity, or if it's just a shrinkage thing, but some stocks just don't seem to hold the magazine high enough when locked in to feed reliably.
On the plus side, the mag hanger issue is a great excuse to upgrade the stock.
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