Problem to be solved: to provide a chamber packing for realizing stable ballistic and high collecting elasticity for a toy gun such as an air gun.Solution: a chamber packing 1 incorporated into Burrell having an opening for adjusting the hop of a spherical beam, and a chamber packing 1 having two rail projections 2 at a position facing the opening, and a toy gun incorporating the same. The rail projection 2 has a semicircular cross section.Diagram
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