Replaceable barrel block for manual and semi-automatic air rifle and air pistols driven by pneumatic system (PCP)

1. A replaceable barrel mechanism comprising:

a lower block and an upper block, wherein the upper block is located above the lower block;

at least one upper block groove positioned under the upper block;

at least one lower block groove positioned on top of the lower block;

at least one fixing screw locking the upper block unto the lower block wherein the at least one fixing screw tightens a connection between the at least one upper block groove and the at least one lower block groove by horizontally sliding the upper block towards a rear end of the lower block such that the at least one upper block groove and the at least one lower block groove mate;

at least one horizontally oriented fixing screw housing located on a rear end of the upper block where the at least one fixing screw can be horizontally mounted;

at least one vertically oriented U-shaped fixing housing, located on the rear end of the lower block, wherein the at least one fixing screw is inserted through the at least one vertically oriented U-shaped fixing housing and into the at least one horizontally oriented fixing screw housing thereby securing the upper block to the lower block;

a vertically oriented cylindrical motion pin located on the lower block;

an ammunition sliding pin incorporating a cylindrical motion pin housing where the vertically oriented cylindrical motion pin inserts into, independent of a caliber of an ammunition used, wherein the vertically oriented cylindrical motion pin has substantially the same diameter as the cylindrical motion pin housing;

an ammunition sliding pin housing located in the upper block where the ammunition sliding pin moves back and forth;

a lower block air passage hole on top of the lower block where air can move through a mated section of the upper block and the lower block;

an upper block air passage hole under the upper block; and

a sealing gasket located between the upper block and the lower block for sealing the moving air.

2. The replaceable barrel mechanism of claim 1 , wherein the upper block further comprises at least one magazine housing.

3. The replaceable barrel mechanism of claim 1 , wherein the at least one horizontally oriented fixing screw housing located on the rear end of the upper block has an opening with threads matching threads of the at least one fixing screw.

4. The replaceable barrel mechanism of claim 1 , wherein the at least one upper block groove is a dovetail groove.

5. The replaceable barrel mechanism of claim 1 , wherein the at least one fixing screw is tightened onto the upper block by rotating the at least one fixing screw into the at least one horizontally oriented fixing screw housing.

6. The replaceable barrel mechanism of claim 1 , wherein the ammunition sliding pin is cylindrical and has a diameter correlating to the caliber of the ammunition used.

7. The replaceable barrel mechanism of claim 1 , wherein the at least one lower block groove is a dovetail groove.

8. The replaceable barrel mechanism of claim 1 , wherein the vertically oriented cylindrical motion pin conveys a motion of a trigger mechanism as the vertically oriented cylindrical motion pin is inserted into the cylindrical motion pin housing when the vertically oriented cylindrical motion pin is mated with the ammunition sliding pin.

9. The replaceable barrel mechanism of claim 1 , wherein the sealing gasket is located between the upper block and the lower block providing an air tight seal thus ensuring against air leakage traveling from an air tube.

10. The replaceable barrel mechanism of claim 1 , wherein the upper block air passage hole is of substantially the same diameter as the lower block air passage hole located on the lower block where both the upper block air passage hole and the lower block air passage hole align with one another.