Did the problem start when you added the silencer?
If so, it's possible it's not a double feed, but the bb is hitting the inside of the silencer and cracking in half. It would not be the first time I've seen this.
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Ár skal r?*sa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.
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