A firearm is provided comprising a frame which defines a forward aperture. A cylinder is mounted rotatably to the frame to rotate on a cylinder axis. The cylinder defines a plurality of passages each at a common radius from the axis, each passage includes a chamber and a rifled bore. At least one of the passages is being chambered for a different caliber than at least one other of the passages.

A forward grip system is disclosed for supporting a paintball gun. The forward grip system has an inner, longer, hollow cylindrical body with threaded sections with two conical ends with slits around them. The middle section of the inner, longer, hollow cylindrical body has a groove for the outer, shorter, hollow cylindrical body to rotate around on. The edges of the grooved middle section of the inner, longer, hollow cylindrical body are raised to secure the outer, shorter, hollow cylindrical body within the grooved middle section as it rotates around the inner, longer, hollow cylindrical body. A vertical shaft is connected onto the outer, shorter, hollow cylindrical body to function as the handle. There are two threaded locking collars for engaging each of the threaded sections of the inner, longer, hollow cylindrical body for the purpose of locking the forward grip system in place onto a paintball barrel.

Embodiments of the invention include a firearm system and method of assembly of the firearm system including a receiver complex including a receiver coupled to a forward receiver. A feed port is positioned between the receiver and the forward receiver, and a striker coil assembly is positioned proximate the receiver, and includes a plurality of strikers each extending at least partially through a coil. An interchangeable barrel is coupled to the forward receiver forming a breech. In some embodiments, the firearm system includes a breech that includes a plurality of side-by-side bores of the barrel. Some embodiments include a magazine coupled to the receiver complex adjacent the feedport to simultaneously feed more than one dischargeable projectile into the feedport with a single charge block. In some embodiments, the charge block includes a plurality of chambers and a plurality of projectiles positioned within the plurality of chambers.

A double barrel adjustment assembly includes first and second barrel receiving members, each of which is formed with a bore for passing therethrough a barrel of a weapon. The first and second barrel receiving members are formed with complementary surfaces. The double barrel adjustment assembly further includes rotatable first and second adjustment members. One end of the first adjustment member is rotatingly mounted in the second barrel receiving member and an opposite end of the first adjustment member is rotatingly mounted in the first barrel receiving member. One end of the second adjustment member is rotatingly mounted in the first barrel receiving member and an opposite end of the second adjustment member is rotatingly mounted in the second barrel receiving member.

A double barrel adjustment assembly includes first and second barrel receiving members, each of which is formed with a bore for passing therethrough a barrel of a weapon. The first and second barrel receiving members are formed with complementary surfaces. The double barrel adjustment assembly further includes rotatable first and second adjustment members. One end of the first adjustment member is rotatingly mounted in the second barrel receiving member and an opposite end of the first adjustment member is rotatingly mounted in the first barrel receiving member. One end of the second adjustment member is rotatingly mounted in the first barrel receiving member and an opposite end of the second adjustment member is rotatingly mounted in the second barrel receiving member.

A mount part for a weapon barrel in a weapon barrel holder having a tubular inner diameter which comprises a first section and an encircling ring-shaped second section which is of greater outer diameter than the first section and than a following third section. The third section has at least one slot. The at least one slot runs substantially perpendicular to the second section. In a particular usage situation, the ring-shaped section has circumferential bevels. This permits usage in a barrel mounting of a multi-barrelled weapon having multiple weapon barrels mounted in a common barrel mounting.

A mount part for a weapon barrel in a weapon barrel holder having a tubular inner diameter which comprises a first section and an encircling ring-shaped second section which is of greater outer diameter than the first section and than a following third section. The third section has at least one slot. The at least one slot runs substantially perpendicular to the second section. In a particular usage situation, the ring-shaped section has circumferential bevels. This permits usage in a barrel mounting of a multi-barrelled weapon having multiple weapon barrels mounted in a common barrel mounting.

An improved barrel clamp assembly for a multi-barreled minigun includes a barrel clamp tube having a front end, a rear end, and a plurality of longitudinal openings extending along a portion the length of the tube between the front end and the rear end. An impeller is mounted in the barrel clamp tube between the tube front end and the tube rear end. The impeller includes a plurality of impeller blades that are spaced around a periphery of the impeller and that project forward from a rear flange portion of the impeller and the impeller blades define a plurality of air channels. A barrel assembly includes the barrel clamp tube, a flash suppressor mounted to the front end of the barrel clamp tube, and a barrel clamp collar mounted to the rear end of the barrel clamp tube. The impeller is mounted to the barrel clamp tube between the flash suppressor and the barrel clamp collar.

An improved barrel clamp assembly for a multi-barreled minigun includes a barrel clamp tube having a front end, a rear end, and a plurality of longitudinal openings extending along a portion the length of the tube between the front end and the rear end. An impeller is mounted in the barrel clamp tube between the tube front end and the tube rear end. The impeller includes a plurality of impeller blades that are spaced around a periphery of the impeller and that project forward from a rear flange portion of the impeller and the impeller blades define a plurality of air channels. A barrel assembly includes the barrel clamp tube, a flash suppressor mounted to the front end of the barrel clamp tube, and a barrel clamp collar mounted to the rear end of the barrel clamp tube. The impeller is mounted to the barrel clamp tube between the flash suppressor and the barrel clamp collar.

A barrel clamp for a Gatling-style firearm, or mini-gun, provides vanes for the direction of fresh air currents into the muzzle area of the firearm. The directed air streams contribute to cooling the barrels while in the firing cycle and also towards the disruption of fuel-rich gasses which contribute to muzzle flash.