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A pneumatic nailer for use with a fluid source includes a housing, a cylinder, a first valve assembly, a piston, and a port assembly. The housing defines a storage chamber configured for fluid communication with the fluid source. The cylinder is configured for movement with respect to the housing be

A pneumatic nailer for use with a fluid source includes a housing, a cylinder, a first valve assembly, a piston, and a port assembly. The housing defines a storage chamber configured for fluid communication with the fluid source. The cylinder is configured for movement with respect to the housing between a first cylinder position and a second cylinder position. An inner side of the cylinder defines a sleeve chamber and an outer side of the cylinder and the housing defines an actuating chamber therebetween. The first valve assembly is connected to the cylinder and is configured to (i) to allow fluid flow from the sleeve chamber to the actuating chamber and (ii) to prevent fluid flow from the actuating chamber to the sleeve chamber. The piston has a piston head and a driver member extending from the piston head.

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1. A pneumatic nailer for use with a fluid source, comprising: a housing defining a storage chamber configured for fluid communication with the fluid source;a cylinder having a sleeve, an actuating structure fixed to said sleeve, a first valve assembly carried by said sleeve, and at least one port d

1. A pneumatic nailer for use with a fluid source, comprising: a housing defining a storage chamber configured for fluid communication with the fluid source;a cylinder having a sleeve, an actuating structure fixed to said sleeve, a first valve assembly carried by said sleeve, and at least one port defined in said sleeve, said cylinder configured for movement with respect to said housing between a first cylinder position and a second cylinder position, an inner side of said sleeve defining a sleeve chamber, an outer side of said sleeve and said housing defining an actuating chamber therebetween on a first side of said actuating structure, and said first valve assembly configured to (i) to allow fluid flow from said sleeve chamber to said actuating chamber and (ii) to prevent fluid flow from said actuating chamber to said sleeve chamber;a piston having a piston head and a driver member extending from said piston head, said piston head being movable within said sleeve chamber between a first piston position and a second piston position, said sleeve and said piston head defining (i) a displacement chamber on a first side of said piston head and (ii) a return chamber on an opposite side of said piston head, said at least one port configured and arranged (i) to fluidly couple said return chamber to said return chamber to said actuating chamber when said cylinder is in said first cylinder position and (ii) to fluidly couple said return chamber to atmosphere when said cylinder is in said second cylinder position; anda second valve assembly at least partially positioned within said housing and moveable between a first valve position and a second valve position, said second valve assembly configured (i) to fluidly couple said displacement chamber to atmosphere when said second valve assembly is in said first valve position and (ii) to isolate said displacement chamber from atmosphere when said second valve assembly is in said second valve position; andan actuator positionable between an actuated position and a deactuated position and configured such that (i) when said actuator is moved from said deactuated position to said actuated position said second valve assembly is caused to move from said first valve position to said second valve position and (ii) when said actuator is moved from said actuated position to said deactuated position said second valve assembly is caused to move from said second valve position to said first valve position. 2. The pneumatic nailer of claim 1 further comprising a biasing member at least partially positioned within said actuating chamber and configured to bias said cylinder toward said first cylinder position. 3. The pneumatic nailer of claim 2, wherein said biasing member is positioned between a first shoulder of said cylinder and a second shoulder of said housing. 4. The pneumatic nailer of claim 1, wherein said first valve assembly includes at least one check valve. 5. The pneumatic nailer of claim 1, wherein: said actuating chamber is configured to store a portion of fluid from the fluid source, andsaid at least one port is configured to transfer said portion of fluid to said return chamber when cylinder is in said first cylinder position. 6. The pneumatic nailer of claim 5, wherein said piston moves to said first piston position in response to said at least one port transferring said portion fluid to said return chamber. 7. The pneumatic nailer of claim 1, wherein said housing defines a first vent passage configured to fluidly couple said displacement chamber to atmosphere when said second valve assembly is in said first valve position. 8. The pneumatic nailer of claim 7, wherein said housing defines a second vent passage configured to fluidly couple said return chamber to atmosphere through said at least one port when said cylinder is in said second cylinder position. 9. A pneumatic nailer for use with a fluid source, comprising: a housing defining a storage chamber configured for fluid communication with the fluid source;a cylinder configured for movement with respect to said housing between a first cylinder position and a second cylinder position, an inner side of said cylinder defining a sleeve chamber and an outer side of said cylinder and said housing defining an actuating chamber therebetween;a first valve assembly carried by said cylinder and configured (i) to allow fluid flow from said sleeve chamber to said actuating chamber and (ii) to prevent fluid flow from said actuating chamber to said sleeve chamber;a piston having a piston head and a driver member extending from said piston head, said piston head being movable within said sleeve chamber between a first piston position and a second piston position, said cylinder and said piston head defining (i) a displacement chamber on a first side of said piston head and (ii) a return chamber on an opposite side of said piston head; andat least one port formed in said cylinder and configured and arranged (i) to fluidly couple said return chamber to said actuating chamber when said cylinder is in said first cylinder position and (ii) to fluidly couple said return chamber to atmosphere when said cylinder is in said second cylinder position. 10. The pneumatic nailer of claim 9 further comprising a second valve assembly at least partially positioned within said housing and moveable between a first valve position and a second valve position, said second valve assembly configured (i) to fluidly couple said displacement chamber to atmosphere when said second valve assembly is in said first position and (ii) to isolate said displacement chamber from atmosphere when said second valve assembly is in said second position. 11. The pneumatic nailer of claim 10 further comprising an actuator positionable between an actuated position and a deactuated position and configured such that (i) when said actuator is moved from said deactuated position to said actuated position said second valve assembly is caused to move from said first position to said second position and (ii) when said actuator is moved from said actuated position to said deactuated position said second valve assembly is caused to move from said second position to said first position. 12. The pneumatic nailer of claim 11 further comprising a biasing member at least partially positioned within said actuating chamber and configured to bias said cylinder toward said first cylinder position. 13. The pneumatic nailer of claim 12, wherein said biasing member is positioned between a first shoulder of said cylinder and a second shoulder of said housing. 14. The pneumatic nailer of claim 9, wherein said first valve assembly. includes at least one check valve. 15. The pneumatic nailer of claim 9, wherein: said actuating chamber is configured to store a portion of fluid from the fluid source when said cylinder is in said second position, andsaid at least one port transfers said portion fluid to said return chamber when cylinder is in said first cylinder position. 16. The pneumatic nailer of claim 15, wherein said piston moves to said first piston position in response to said at least one port transferring said portion of fluid to said return chamber.