A rotary ammunition magazine cooperates with a bolt catch to hold the bolt of a firearm out of battery in an open position after the last round has been fired. A cam mounted on the rotor of the magazine actuates a movable body on the magazine housing as the cam rotates to feed ammunition to the action. The body moves to an extended position and engages a bolt catch pivotably mounted in the firearm receiver. The bolt catch is pivoted by the body into a position where it will engage the bolt and prevent it from returning to battery after the last round has been fired.

A rotary ammunition magazine cooperates with a bolt catch to hold the bolt of a firearm out of battery in an open position after the last round has been fired. A cam mounted on the rotor of the magazine actuates a movable body on the magazine housing as the cam rotates to feed ammunition to the action. The body moves to an extended position and engages a bolt catch pivotably mounted in the firearm receiver. The bolt catch is pivoted by the body into a position where it will engage the bolt and prevent it from returning to battery after the last round has been fired.

A rotary ammunition magazine cooperates with a bolt catch to hold the bolt of a firearm out of battery in an open position after the last round has been fired. A cam mounted on the rotor of the magazine actuates a movable body on the magazine housing as the cam rotates to feed ammunition to the action. The body moves to an extended position and engages a bolt catch pivotably mounted in the firearm receiver. The bolt catch is pivoted by the body into a position where it will engage the bolt and prevent it from returning to battery after the last round has been fired.

A structure of a wheel-type positioning device includes a gun body, a wheel and a grip portion. A bullet is placed into a receiving slot of the wheel through a lead trajectory on the gun body. The receiving slots of the wheel can sequentially correspond to a barrel to complete loading actions through frontward and rearward reciprocating displacement actions of the grip portion, and through a linking rod of the grip portion driving a limiter thereon to rotate the wheel.

A structure of a wheel-type positioning device includes a gun body, a wheel and a grip portion. A bullet is placed into a receiving slot of the wheel through a lead trajectory on the gun body. The receiving slots of the wheel can sequentially correspond to a barrel to complete loading actions through frontward and rearward reciprocating displacement actions of the grip portion, and through a linking rod of the grip portion driving a limiter thereon to rotate the wheel.

A rotary ammunition magazine for a rifle has a follower that is spring biased and rotates about an axis to move cartridges for feeding to the rifle's chamber. The follower has a surface portion which engages the last cartridge in the stack. The surface portion has one or more characteristics including a transverse orientation angle, a longitudinal orientation angle and an arcuate shape which determine the direction of the force vector and the lengthwise load distribution on the cartridge.

A rotary ammunition magazine for a rifle has a follower that is spring biased and rotates about an axis to move cartridges for feeding to the rifle's chamber. The follower has a surface portion which engages the last cartridge in the stack. The surface portion has one or more characteristics including a transverse orientation angle, a longitudinal orientation angle and an arcuate shape which determine the direction of the force vector and the lengthwise load distribution on the cartridge.

A rotary ammunition magazine for a rifle has a follower that is spring biased and rotates about an axis to move cartridges for feeding to the rifle's chamber. The follower has a surface portion which engages the last cartridge in the stack. The surface portion has one or more characteristics including a transverse orientation angle, a longitudinal orientation angle and an arcuate shape which determine the direction of the force vector and the lengthwise load distribution on the cartridge.

A rotary ammunition magazine for a rifle has a follower that is spring biased and rotates about an axis to move cartridges for feeding to the rifle's chamber. The follower has a surface portion which engages the last cartridge in the stack. The surface portion has one or more characteristics including a transverse orientation angle, a longitudinal orientation angle and an arcuate shape which determine the direction of the force vector and the lengthwise load distribution on the cartridge.

A rotary ammunition magazine for a rifle has a follower that is spring biased and rotates about an axis to move cartridges for feeding to the rifle's chamber. The follower has a surface portion which engages the last cartridge in the stack. The surface portion has one or more characteristics including a transverse orientation angle, a longitudinal orientation angle and an arcuate shape which determine the direction of the force vector and the lengthwise load distribution on the cartridge.