Powder charge operated setting tool

Powder charge operated setting tool comprising a housing (1) having a leading end and a trailing end spaced apart in a setting direction of the setting tool, an axially extending barrel (11) axially displaceably mounted in said housing (1), a breech member (17) axially displaceably mounted in the trailing end of said housing rearwardly of said barrel, a stationary stop (3a) at the trailing end of the housing (1) and a displaceable stop (17e) at a trailing end of said breech member (17), the stationary stop (3a) and the displaceable stop (17e) limit the displacement of the breech member (17) counter to the setting direction of the setting tool, a pressure spring (18) located within said housing (1) and biasing the breech member (17) in the setting direction, and the barrel (11) comprising a chamber (11b) at a trailing end thereof for receiving a propellant charge (15), wherein the improvement comprises an axially extending guide tube having a leading end and a trailing end axially displaceably mounted in the setting direction within said housing, a first shoulder (8b) on said guide tube (8) adjacent the leading end thereof, a second shoulder (11e) on the leading end of said barrel (11) adjacent the leading end thereof and facing said guide tube shoulder (8b), said first shoulder (8b) and second shoulder (11e) limit displacement of the barrel counter to the setting direction after a trailing end of said barrel (11) contacts a leading end of the breech member (17) and the breech member continues to move counter to the setting direction, the distance in the setting direction between the stationary stop (3a) and the first shoulder (8b) in the housing is greater than a corresponding distance between the displaceable stop (17e) and the second shoulder (11e) on the barrel when the barrel (1) and the breech member (17) are in spaced relation in a neutral position.