Fastening element setting gun with an ejection member

Explosive charge driven setting gun for driving fastening elements into hard receiving materials such as steel, concrete and the like, comprising a gun housing, magazine means for feeding caseless propellant charges within said housing, means movably displaceable within said housing including at least one firing chamber with said firing chamber being movable between spaced positions including a loading position for receiving a caseless charge from said magazine means, a firing position for igniting the charge within said firing chamber and an ejecting position for clearing said firing chamber, wherein the improvement comprises that said movably displaceable means includes an ejecting member positioned adjacent the location of said firing chamber in the ejecting position and arranged to be moved through said firing chamber for clearing the chamber, and said ejecting member having a cross sectional shape transverse to its direction of movement through said firing chamber which is substantially the same as the cross sectional shape of said firing chamber in the same transverse direction.