Other

Ronald G Sebeck, Jr

Matthew R Gibbons

Gould Gibbons, Iii

Andrew Gibbons

Ammunition cartridges for hunting big game with an AR15 rifle are provided while maintaining a size of the ammunition cartridge that permits multiple ammunition cartridges to be inserted into an AR15 rifle magazine in alternating side by side relation. Each cartridge has a rim diameter of 0.422 inches, extractor groove and a slight tapered main body base of 0.36&#xb0;. In one embodiment, the main base body extends to form a cartridge with total length of 1.8 inches and nominal body taper of 0.020 inches to accept a bullet with a diameter of 0.400 inches. In other embodiments, the main body base extends to a shoulder and a neck to form a cartridge with a total length of 1.66 inches. The shoulder tapers to the neck at a 35&#xb0; angle with a nominal body taper of 0.014 inches. These embodiments accept bullets with diameters of 0.277, 0.284 and 0.308 inches.

Ammunition cartridge

A muzzle loading conversion system for a rifle having an upper and lower receiver. A barrel is slidingly secured to the upper receiver. A stationary bolt member is positioned within the upper receiver with a firing pin slidably received within a bolt opening. A breech plug mechanism is threadedly secured to the barrel within a barrel end section and the breech plug mechanism is adapted to receive a primer within a breech plug mechanism chamber which is in fluid communication with the bolt through opening. The breech plug mechanism is engaged with the bolt member within a breech plug member receiving chamber.

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Westminster, MD, United States of America

Ronald G Sebeck, Jr