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A metallic liner for a composite reinforced high pressure gas cylinder is composed of a seamless metal tube contoured with a top dome and bottom dome. The liner is further composed of a seamless top metal end cap having a mating shape of the top dome and a seamless bottom metal end cap having a mati

A metallic liner for a composite reinforced high pressure gas cylinder is composed of a seamless metal tube contoured with a top dome and bottom dome. The liner is further composed of a seamless top metal end cap having a mating shape of the top dome and a seamless bottom metal end cap having a mating shape of the bottom dome. Alternatively, an extruded cup is shaped to a dome at the open end and one or two seamless metal end caps are used. In the method of manufacturing, the top and bottom ends of the metal tube are contoured, the end caps are produced, and one or two end caps are attached to the ends of the tube.

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1. A liner for a composite reinforced high pressure gas tank comprising: a metal tube that is seamless and integrally formed as a single unitary base piece, comprising: a cylindrical sidewall having a substantially constant diameter;a top end comprising: a top transition zone contoured to seamlessly

1. A liner for a composite reinforced high pressure gas tank comprising: a metal tube that is seamless and integrally formed as a single unitary base piece, comprising: a cylindrical sidewall having a substantially constant diameter;a top end comprising: a top transition zone contoured to seamlessly transition between the cylindrical sidewall and the extended cylindrical neck,an extended cylindrical neck with an opening, anda substantially variable diameter narrowing along said top transition zone from the cylindrical sidewall to the extended cylindrical neck; and,a bottom end having a bottom transition zone contoured to seamlessly transition from said cylindrical sidewall to a distal end;a seamless top metal end cap integrally formed as a first single unitary overlay piece, said top metal end cap comprising an inner surface and an outer surface with solid metal therebetween, wherein the entire inner surface is in direct contact with the top end, wherein the top metal end cap overlays the top transition zone and a top portion of said cylindrical sidewall; and,a seamless bottom metal end cap integrally formed as a second single unitary overlay piece, said bottom metal end cap overlays the bottom end and a bottom portion of said cylindrical sidewall. 2. The liner of claim 1, wherein the extended cylindrical neck has internal threads. 3. The liner of claim 1, wherein the extended cylindrical neck has external threads. 4. The liner of claim 1, wherein the extended cylindrical neck has external threads and the top metal end cap has internal threads to mate with the external threads. 5. The liner of claim 1, wherein the metal tube, the top metal end cap, and the bottom metal end cap are made of 6000 series aluminum alloy. 6. The liner of claim 1, wherein the distal end of said bottom end comprises an integral solid central stub. 7. The liner of claim 1, wherein said distal end of said bottom end is a bottom dome. 8. The liner of claim 1, wherein said distal end of said bottom end is a second extended cylindrical neck configured with an opening. 9. The liner of claim 8, wherein the second extended cylindrical neck has external threads and the bottom metal end cap has internal threads to mate with the external threads. 10. The liner of claim 8, further comprising an a top embedded fitting surrounded by the extended cylindrical neck of the top end and a bottom embedded fitting surrounded by the second extended cylindrical neck, said top embedded fitting and said bottom embedded fitting each selected from a group consisting of a nozzle, a flange, a solid plug and a threaded connection. 11. The liner of claim 8, wherein the second extended cylindrical neck has internal threads. 12. The liner of claim 8, wherein the second extended cylindrical neck has external threads. 13. A method of making the liner of claim 1, comprising the steps of: contouring the top end of the metal tube to seamlessly transition from the cylindrical sidewall into the extended cylindrical neck to create the top transition zone;contouring the bottom end of the metal tube to seamlessly transition from the cylindrical sidewall to the distal end to create the bottom transition zone;shaping metal to integrally form the seamless bottom metal end cap as the second single unitary overlay piece;shaping metal to integrally form the seamless top metal end cap as the first single unitary overlay piece;attaching the bottom metal end cap to the bottom end of said metal tube; and,attaching the top metal end cap to the top end of said metal tube. 14. The method of claim 13, wherein the step of contouring the top end of the metal tube, and the step of contouring the bottom end of the metal tube are accomplished by spinning the metal tube using a computer numerical control mechanical spinning and forming process. 15. The method of claim 13, wherein the step of shaping metal to integrally form the seamless bottom metal end cap and the step of shaping metal to integrally form the seamless top metal end cap are performed by a metal shaping method selected from a group consisting of cold forging, hydro forming, and spinning. 16. The method of claim 13, wherein the step of attaching the bottom metal end cap to the bottom end of said metal tube and the step of attaching the top metal end cap to the top end of said metal tube are achieved by an attachment means selected from a group consisting of bonding complementary parts together with a structural adhesive; shrink fitting complementary parts together; threading complementary parts together; and fastening complementary parts together with a lock nut. 17. The method of claim 13, further comprising the step of heat treating the metal tube, the top metal end cap, and the bottom metal end cap with common materials simultaneously under a common process control in a common furnace.