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In the fourth and final prototype, the upper and lower receiver were hinged with the now-familiar hinge and takedown pins, and the charging handle did not reciprocate and was not attached to the bolt carrier. [11] For a 7.62mm NATO rifle, the AR-10 prototype was incredibly lightweight at only 6.85 lb empty. [11]
The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge. [216]
The Aeroprediction Code is a semi-empirical computer program that estimates the aerodynamics of weapons over the Mach number range 0 to 20, angle of attack range 0 to 90 degrees, and for configurations that have various cross sectional body shapes.
The J-20 is designed as an air superiority fighter with precision strike capability. [13] The aircraft has three notable variants : the initial production model, the revised airframe variant with new engines and thrust-vectoring control, and the aircraft-teaming capable twin-seat variant.
Dillon Aero manufactures the Air Force GAU-2B/A (Army M134) 7.62×51mm minigun, which is used primarily by 160th SOAR. The company completely redesigned the weapon and significantly improved its reliability while reducing its weight.
Masten Space Systems was a Mojave, California based rocket company that was developing a line of reusable VTVL spacecraft, and related rocket propulsion hardware.. Masten Space Systems competed in the NASA and Northrop Grumman Lunar Lander Challenge X Prize in 2009, winning the level one second prize of US$150,000 [4] [5] and the level two first prize of US$1,000,000.
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The development of the S&T Daewoo K11 dual-barrel air-burst weapon, which uses 5.56×45mm NATO and 20×30mm air-burst grenade, prompted the South Korean military to plan for the replacements of all K2 rifles in service with the K11, making K11 the standard service rifle for the armed forces.
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