Abstract: A power actuated tool (20) for driving a fastener into a substrate such as steel or concrete, comprises a housing (2), a barrel assembly (5) mounted to the housing, and a piston displaceable within the barrel assembly upon firing of the tool to drive a fastener from the forward end (25) of the barrel into the substrate, at least a forward end of the barrel assembly being mounted for axial movement relative to the housing whereby firing of the tool requires the forward end (25) of the barrel assembly to be pressed against the substrate to cause retraction of the forward end relative to the tool housing. A telescope shroud (21) surrounds the forward end of the barrel assembly to at least partially suppress noise emission resulting from firing of the tool.

Abstract: A manually operably cartridge dispensing gun(1) for cartridges of the kind containing two components, said gun including a bed(2) to captively retain the cartridge, a manually operable drive assembly to advance inner(4) and outer(5) concentrically arrranged piston pushers against corresponding pistons in the cartridge, the outer piston pusher(5) being dimensioned to bear against a circumferentially outermost piston in the cartridge and including a central aperture to accomodate the inner piston pusher(4) of a first dimension for use with an inner piston of a cartridge having a first component ratio, said inner piston pusher(4) being selectively reconfigurable to a second, reduced, dimension for use with an inner piston of a cartridge having a second component ratio.