Abstract: An air path arrangement for a pneumatic nail gun includes cylinder received in a barrel and a handle is connected to the barrel. A space is defined between the cylinder and an inner periphery of the barrel. A connection path communicates between the interior and a first partition of the chamber. A side path communicates between a space between the cylinder and an inner periphery of the barrel, and a second partition of the chamber. The first partition communicates with an inlet and an outlet in the handle. A movable member, a guide member, a valve, an axle and a base are received in the chamber. The guide member is located between the first and second partitions. The guide member has apertures which communicates with the first and second partitions so that the movable member and the valve are movably received in the first partition and the second partition.

Abstract: A device for providing sufficient time to allow the piston to move backward completely of a nailer includes a movable member engaged with a front open end of the cylinder in the barrel of the nailer and a fixed member which is matched with the movable member. The movable member is pushed toward the fixed member by the piston when firing a nail and a passage is defined between the movable member and the fixed member so as to introduce air into the cylinder to push the piston backward. A space is defined between the movable member and the inner periphery of the cylinder when the movable member is moved toward the fixed member. A tiny hole is defined through the wall of the cylinder and release the air in the space slowly so that the passage is not sealed for a period of time such that the piston has sufficient time to move back.