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  2. .50 BMG - Wikipedia

    en.wikipedia.org/wiki/.50_BMG

    The specified maximum diameter of an unfired .50 BMG bullet is 0.510-inch (13.0 mm); while this appears to be over the .50 inch (12.7 mm) maximum allowed for non-sporting Title I firearms under the U.S. National Firearms Act, the barrel of a .50 BMG rifle is only .50 inch (12.7 mm) across the rifling lands and slightly larger in the grooves ...

  3. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  4. List of naval guns by caliber - Wikipedia

    en.wikipedia.org/wiki/List_of_naval_guns_by_caliber

    102 mm (4.0 in) BL 4 inch Mk VII 50-caliber United Kingdom: World War I - World War II 102 mm (4.0 in) BL 4 inch Mk VIII & XI 40-caliber United Kingdom: World War I - World War II 102 mm (4.0 in) BL 4 inch Mk IX naval gun 45-caliber United Kingdom: World War I - World War II 102 mm (4.0 in) QF 4 inch Mk I - III 40-caliber United Kingdom

  5. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    Fontanini produces 5 inch nativity scene figures at this scale. 1:14: 0.8571428 in: 21.77 mm Tamiya Tamiya 56301 RC 1:14 King Hauler, RC Tractor Trucks 1:14 Scale. 1:13.71: 22.225 mm Model railway scratchbuilders' scale at 7 ⁄ 8 inches to a foot, commonly used with 45 mm gauge track to represent 2 ft gauge prototypes. 1:13: 59 ⁄ 64 in: 23.44 mm

  6. .50 caliber handguns - Wikipedia

    en.wikipedia.org/wiki/.50_caliber_handguns

    A .50 caliber handgun is a handgun firing a bullet measuring approximately 0.5 inches (12.7 mm) in diameter intended with the task of penetration. Historically, many black powder pistols fired bullets with diameters well above a half inch.

  7. XM913 chain gun - Wikipedia

    en.wikipedia.org/wiki/XM913_chain_gun

    Although its shells, 50 x 228 mm, are twice the diameter of the 25×137mm cartridge of the M242, the 50mm cannon is not much longer than the smaller weapon. [2] The overall lengths of the 25mm cannon and 50mm cannon are 105.2 inches (267 cm) and 117.7 inches (299 cm), respectively; while the portion of the gun that intrudes into the turret are ...

  8. M2 Browning - Wikipedia

    en.wikipedia.org/wiki/M2_Browning

    Cooled by the aircraft's slip-stream, the air-cooled 12.7 mm AN/M2 was fitted with a substantially lighter 36-inch (91 cm) length barrel, reducing the weight of the complete unit to 61 pounds (28 kg), [88] [89] which also had the effect of increasing the rate of fire. The full official designation for this weapon was "Browning Machine Gun ...

  9. Caliber - Wikipedia

    en.wikipedia.org/wiki/Caliber

    medium-bore refers to calibers with a diameter of 0.33 inches (8.4 mm) to 0.39 inches (9.9 mm) large-bore refers to calibers with a diameter of 0.40 inches (10 mm) or larger There is much variance in the use of the term "small-bore", which over the years has changed considerably, with anything under 0.577 inches (14.7 mm) considered "small-bore ...