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Well, since the M4 open bolt isn't released yet, only time will tell. If you want the latest and greatest, I would get a factory open bolt... but that's just because it will have the latest version of everything, stock.
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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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