I own the .40 cal Subbie - it's only 8 months old but it experiences occasional ejection issues as well...not as much if I meticulously clean it after every shoot and keep well oiled.
From different sources I've been told that eventually after the gun breaks in the problem goes away, although mine has actually experienced some chipping aroud the ejection area in the composite material.
I also have experienced NO ejection problems when I use stainless steel 11-round mag's that I bought from Check-Mate Industries
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