(57) A drum magazine for a gun has a circularly cross-sectioned housing (40) with a feed
throat (415) extending from the housing for releasing cartridges and concentric sprockets
(42, 43, 44) having serrations nesting cartridges. A torsion spring (46) is arranged
to rotatingly drive the sprockets and feed ramps (434, 441, 455, 455', 471, 471')
are provided for assisting the cartridges to traverse from the sprockets to the feed
throat (415).
The feed throat has two lips and one of the lips (417) is pivotally biassed to act
as a one way valve such that in one position cartridges are prevented from being ejected
in a direction perpendicular to the housing axis and yet cartridges may be inserted
into the housing in a direction perpendicular to the housing axis.
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