A barrel assembly for a fastener driving tool includes an outer sleeve adapted for connection to the driving tool, an inner sleeve retractably attached within the outer sleeve and a barrel pivotally and retractably connected to the inner sleeve. A breech collar is positioned in the inner sleeve and matingly engages the barrel end. Guide fingers extend through the barrel wall into the bore to position and guide the fasteners placed therein. The fasteners are inserted into the barrel bore by pivotally opening the barrel and exposing the barrel bore at the connected end of the barrel.
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