Ok....so my S12 has had No luck at all cycling any low brass wile set on one or two. I tried heavy dove loads thinking a little heavier may work for me but no luck. I ordered a "reliability kit" with an longer spring, a DPH 6 position gas plug and a new puck (i think the puck is ccs branded) Yet still it will not eject a low brass shell. The gun works fine with buck shot or Centurion multi-defence (love it!). I have noticed marking on spent some shells where the claw grabs the case above the brass. Im about out of ideas here so thanks for any help