Gas Piston Conversion Assembly

A gas piston conversion comprising:

• an AR-15 rifle having a gas tube and a bolt mechanism, the gas tube having an integrally closed forward end;
• a bore extending perpendicularly between the gas tube and a barrel of the AR-15 rifle, the bore being rearwardly spaced from the integrally closed front end of the gas tube;
• an upper receiver being installable into said AR-15 rifle, said upper receiver having a forward end, said forward end having a well extending rearwardly in said upper receiver;
• and
• a piston being insertable into said well, said piston being in fluid communication with said gas tube when said piston is inserted into said well and said upper receiver is integrated into said AR-15 rifle, said piston being urged rearwardly in said well by pressurized gasses when said AR-15 rifle is fired, said piston striking said bolt mechanism of said AR-15 rifle when said piston is urged rearwardly for cycling said bolt mechanism, said piston having a front end and a rear end, said front end having a diameter being greater than a diameter of said rear end, said front end receiving gas pressure from said gas tube when said AR-15 rifle is fired thereby urging said piston rearwardly in said well, said rear end striking said bolt mechanism when said piston is urged rearwardly in said well for cycling said bolt mechanism, said piston being urged forwardly in said well by said bolt mechanism when said bolt mechanism cycles.