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The 6mm Advanced Rifle Cartridge (6×38mm), or 6mm ARC for short, is a 6 mm (.243) caliber intermediate rifle cartridge introduced by Hornady in 2020, as a low-recoil, high-accuracy long-range cartridge, designed for use in the M16 platform at request of a specialized group within the U.S. DoD for its multipurpose combat rifle program.
The 7.62×39mm rifles and conversion kits began shipping in July 2008. [10] In August 2009 Robinson Arms began shipping 3 different sized upper receivers enabling PDW and pistol style variants: [11] Standard Upper Receiver – The original length and designed to support barrel lengths from 11" to 18.6".
The 6mm bullet is slightly wider, and the standard 6×35mm bullet slightly heavier, than the standard 5.56mm bullet (65 grains (4.2 g) versus 62 grains (4.0 g)). [ 1 ] Fired from a 10-inch (250 mm) barrel, KAC claims that the 6×35mm cartridge reaches a muzzle velocity of 2,450 ft/s (750 m/s), slightly faster than the muzzle velocity of a 5.56 ...
The resulting COAL of 2.300" is only 1.02 mm longer than the maximum COAL for chambering a cartridge in the smaller AR-15; however, the 45 Raptor chamber pressure is allowed to be as high as 62,000 PSI. This means that the stronger AR-10 receiver and bolt carrier group is needed for shooting this cartridge.
The 6XC is a 1000-yard cartridge, comparable to benchrest calibers such as 6x47mm Swiss Match, 6.5×47mm Lapua and 6 mm/22-250; it fits into cartridge class that exceeds the velocities of benchrest calibers such as 6mm BR Remington, 6mm BRX and 6mm Dasher. David Tubb has claimed several wins with the 6XC in NRA High Power National Championships ...
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The upper and lower receivers were developed specifically to fit this Magpul magazine and optimized around the 6.8×43mm round. The flagship model of the Six8 series is the UCIW which features an 8.5-inch barrel.
M16 lower receiver with a redesigned upper receiver fed by FN P90 magazines Brügger & Thomet MP9: 6.5×25mm CBJ, 9×19mm: Switzerland: yes CF-05: 5.8×21mm: China: no Competitor to the QCW-05: Colt MARS 5.56×30mm MARS United States: no Colt SCAMP.22 SCAMP United States: no ČZW-438: 4.38×30mm Libra: Czech Republic: no FN P90: 5.7×28mm ...