A special stock assembly for break barrel air guns includes a bullpup stock assembly which allows a break barrel air gun to normally break without requiring any modification to the cylinder, or cocking mechanism. The invention can include the mechanical components of a break barrel air rifle as part of an original manufacture with the gun by moving the trigger assembly forward, or as an after market retrofit to an existing gun, in which case a cable linkage is provided between the in situ OEM trigger assembly and an additional trigger pull provided with the bullpup stock assembly. The cable linkage connects a forward trigger assembly to the OEM trigger and can have a 1:1 ratio of trigger movement between the forward trigger pull and the OEM trigger, or another ratio as determined by the linkage elements. The forward trigger assembly can be purely mechanical, or incorporate a servo and/or solenoid with a power source such as a battery to augment trigger pull by a trigger finger.

Techniques and componentry are disclosed for an air gun with a cocking linkage shoe. The air gun includes a barrel pivotally attached to a cylinder. Attached to the barrel is a linkage. The linkage is operatively coupled to a piston within the cylinder and includes a lever and a shoe. The lever has a first end attached to the barrel and a second end that includes a first surface having a concave or convex shape. The shoe is attached to the lever and operatively connected to the piston. The shoe includes a second surface having a concave or convex shape in tangential contact with the first surface of the lever. The air gun further includes a trigger mechanism configured to release the piston in response to operating the trigger mechanism.

Techniques and componentry are disclosed for an air gun with a cocking linkage shoe. The air gun includes a barrel pivotally attached to a cylinder. Attached to the barrel is a linkage. The linkage is operatively coupled to a piston within the cylinder and includes a lever and a shoe. The lever has a first end attached to the barrel and a second end that includes a first surface having a concave or convex shape. The shoe is attached to the lever and operatively connected to the piston. The shoe includes a second surface having a concave or convex shape in tangential contact with the first surface of the lever. The air gun further includes a trigger mechanism configured to release the piston in response to operating the trigger mechanism.

Techniques and componentry are disclosed for an air gun with a cocking linkage shoe. The air gun includes a barrel pivotally attached to a cylinder. Attached to the barrel is a linkage. The linkage is operatively coupled to a piston within the cylinder and includes a lever and a shoe. The lever has a first end attached to the barrel and a second end that includes a first surface having a concave or convex shape. The shoe is attached to the lever and operatively connected to the piston. The shoe includes a second surface having a concave or convex shape in tangential contact with the first surface of the lever. The air gun further includes a trigger mechanism configured to release the piston in response to operating the trigger mechanism.

Techniques and componentry are disclosed for an air gun with a cocking linkage shoe. The air gun includes a barrel pivotally attached to a cylinder. Attached to the barrel is a linkage. The linkage is operatively coupled to a piston within the cylinder and includes a lever and a shoe. The lever has a first end attached to the barrel and a second end that includes a first surface having a concave or convex shape. The shoe is attached to the lever and operatively connected to the piston. The shoe includes a second surface having a concave or convex shape in tangential contact with the first surface of the lever. The air gun further includes a trigger mechanism configured to release the piston in response to operating the trigger mechanism.

An air gun assembly includes a gun tube and a pressure tube assembly. The gun tube defines a first aperture. The pressure tube assembly includes a fill block and a cylinder coupled to each other. The fill block defines a second aperture and the cylinder defines a chamber configured to contain compressed gas. The air gun assembly includes a pin disposed through the first aperture and the second aperture to couple together the fill block and the gun tube. The pin defines a channel. The air gun assembly also includes a valve assembly attached to the pin and at least partially disposed inside of the channel. The valve assembly is configured to selectively allow fluid communication into the chamber via the channel.

An air gun assembly includes a gun tube and a pressure tube assembly. The gun tube defines a first aperture. The pressure tube assembly includes a fill block and a cylinder coupled to each other. The fill block defines a second aperture and the cylinder defines a chamber configured to contain compressed gas. The air gun assembly includes a pin disposed through the first aperture and the second aperture to couple together the fill block and the gun tube. The pin defines a channel. The air gun assembly also includes a valve assembly attached to the pin and at least partially disposed inside of the channel. The valve assembly is configured to selectively allow fluid communication into the chamber via the channel.