Abstract: A cartridge for firearms includes a bullet connected to a casing. The casing includes a cylindrical wall that extends to an end member opposite the bullet, a hollow interior formed by the wall and the end member, means for receiving a priming composition, and means for compressing the priming composition with a firing pin engaging the end member. Propellant is placed in the hollow interior and ignited by the compressed priming composition.

Abstract: A cartridge for firearms includes a bullet connected to a casing. The casing includes a cylindrical wall that extends to an end member opposite the bullet, a hollow interior formed by the wall and the end member, means for receiving a priming composition, and means for compressing the priming composition with a firing pin engaging the end member. Propellant is placed in the hollow interior and ignited by the compressed priming composition.

Abstract: A cartridge for firearms includes a bullet connected to a casing. The casing includes a cylindrical wall that extends to an end member opposite the bullet, a hollow interior formed by the wall and the end member, means for receiving a priming composition, and means for compressing the priming composition with a firing pin engaging the end member. Propellant is placed in the hollow interior and ignited by the compressed priming composition.

Abstract: The present invention relates to a cartridge for use with firearms capable of firing 0.22 caliber rimfire cartridges. The cartridge includes a bullet connect to a casing. The casing includes a cylindrical wall that extends to an end member opposite the bullet and a hollow interior formed by the wall and the end member. A flange extends radially outwardly from the cylindrical wall at the end member. A projection connected with the wall extends inwardly into the hollow interior. A recess for receiving priming composition is formed by the projection and the end member. A firing pin configured for firing the cartridge of the present invention is also provided.

Abstract: Reliability of a multi-lug breech bolt is improved by modifying the bearing relationship between the bolt lugs and the matching lugs within a gun receiver. This procedure is applied to a gun that has a receiver housing a breech bolt and an extractor. The extractor is coupled to the breech bolt and configured to move relative thereto. The bolt for this gun has at least five radially extending bolt lugs configured for bearing contact with the receiver when positioned for firing. The bolt lugs include a first, second, and third bolt lug with the first and second bolt lugs being adjacent and defining a gap configured to receive the extractor therebetween. The third bolt lug extends from the bolt opposite the gap. Stress imparted to the first and second bolt lugs from firing the gun is reduced by altering the gun to prevent formation of a bearing relationship between the third bolt lug and the receiver when the bolt lugs are positioned for firing. The gun is reassembled as part of the procedure.

Abstract: A removable ammunition magazine has a body with a side wall. The body defines a passage sized to hold ammunition and an opening intersecting the passage. The opening is sized to pass ammunition therethrough and includes a notch in the side wall. A follower is moveably positioned within the passage for positioning beneath ammunition placed within the passage. A magazine spring yieldingly urges the follower toward the opening. A bolt catch actuator is coupled to the follower. The actuator includes an actuation finger carried with the follower and an activation spring in contact with the finger. The spring projects the finger through the notch when the follower is aligned with the notch. A fire arm with a magazine having a bolt catch actuation finger movable relative to the follower is also disclosed.