Rotary magazine and bolt catch

An ammunition magazine for a firearm having a bolt capable of reciprocal motion between an open and a closed position, a finger extending from said bolt, a bolt catch movably mounted on said firearm, said bolt catch having a first surface and a second surface, said second surface being engageable with said bolt and comprising a hook, said magazine comprising:

• a housing for receiving said ammunition;
• a cartridge rotor mounted within said housing, said cartridge rotor being rotatable relatively to said housing about an axis for advancing said ammunition through said housing;
• a spring positioned within said housing for rotating said cartridge rotor about said axis;
• a cam attached to said cartridge rotor and rotating therewith about said axis;
• a body mounted on said housing proximate to said cam, said body being slidably movable into an extended position wherein a portion of said body projects from said housing, said portion of said body being adapted to engage said first surface of said bolt catch;
• a cam follower mounted on said body, said cam follower being engageable with said cam, rotation of said cam sliding said body into said extended position upon engagement of said cam and said cam follower;
• wherein
• when said body moves into said extended position, said bolt catch is moved into a position wherein said second surface engages said bolt such that said hook captures said finger, said hook and said finger having non-parallel engagement surfaces that prevent movement of said bolt catch away from said bolt to allow release of said bolt into said closed positioned until said bolt is moved further into said open position away from said hook.