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450mm DRS Compact Tube FX 21728: The 450mm DRS Compact Tube FX 21728 is the ideal choice for those seeking a compact and efficient design for their FX DRS. With a specific length of 450mm, this aluminum tube ensures a perfect fit for compact barrels of 500mm in length. With an air capacity of 208cc and a maximum filling pressure of 230 bar, this tube provides an optimal balance between power and portability.