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SOPMOD. The Special Operations Peculiar MODification (SOPMOD) kit is an accessory system for the M4A1 carbine, CQBR, FN SCAR Mk 16/17, HK416 and other weapons used by United States Special Operations Command (USSOCOM) special forces units, though it is not specific to SOCOM. The kit allows US Special Operations Forces (US SOF) personnel to ...
Mk 48 Mod 1 US Air Force Staff Sergeant with the Mk 48 Mod 1 in Afghanistan, 2011. The Mk 48 Mod 1 is an update of the Mk 48 Mod 0, which is also made in FN-America. Like the Mod 0, it is essentially an M249 scaled up to fire the 7.62×51mm NATO round. The Mod 1 utilizes a 19.75-inch barrel, weighs in at 18.37 lb unloaded.
The ammunition was about 7 lb (3.2 kg) heavier than a 4-inch/40 caliber round. The Mod 1 was a Mod 0 that used a conical steel liner and the Mod 2 was either a Mod 0 or Mod 1 that was relined using a conical nickel-steel liner and a shoulder on the breech end. [3] Gun No. 353 was the prototype of the Mark 8 and was test fired on 22 September 1910.
The firing order has been changed from that shared by all previous Modular V8s (1-3-7-2-6-5-4-8) to that of the Ford Flathead V8 (1-5-4-8-6-3-7-2). [17] Compression ratio is 11.0:1, and despite having port fuel injection (as opposed to direct injection) the engine can still be run on 87 octane gasoline.
M242 Bushmaster. The M242 Bushmaster chain gun is a 25 mm (25×137mm) single-barrel chain-driven autocannon. It is used extensively by the U.S. military, such as in the Bradley fighting vehicle, as well as by other NATO members and some other nations in ground combat vehicles and various watercraft. Hughes Helicopters in Culver City, California ...
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The Browning automatic rifle (BAR) is a family of American automatic rifles and machine guns used by the United States and numerous other countries during the 20th century. . The primary variant of the BAR series was the M1918, chambered for the .30-06 Springfield rifle cartridge and designed by John Browning in 1917 for the American Expeditionary Forces in Europe as a replacement for the ...
The former are ≡ ±1 (mod 5) and the latter are ≡ ±2 (mod 5). Since the only residues (mod 5) are ±1, we see that 5 is a quadratic residue modulo every prime which is a residue modulo 5. −5 is in rows 3, 7, 23, 29, 41, 43, and 47 but not in rows 11, 13, 17, 19, 31, or 37.