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The M240 machine gun, officially the Machine Gun, 7.62 mm, M240, is the U.S. military designation for the FN MAG, [6] a family of belt-fed, gas-operated medium machine guns that chamber the 7.62×51mm NATO cartridge. [1] The M240 has been used by the United States Armed Forces since the late 1970s.
M240B – 7.62×51mm medium machine gun used by infantry, and light vehicles and helicopters. Mk48 Mod 1 – 7.62×51mm light machine gun, used by US MARSOC. M249E4 – 5.56×45mm light machine gun, infantry support weapon. Not replaced, but being supplanted by the M27 IAR.
A pallet of "8-inch" concrete blocks An interior wall of painted concrete blocks Concrete masonry blocks A building constructed with concrete masonry blocks. A concrete block, also known as a cinder block in North American English, breeze block in British English, or concrete masonry unit (CMU), or by various other terms, is a standard-size rectangular block used in building construction.
It combined the 2K11 Krug chassis with a modified version of the 240 mm M240 mortar, the 2B8 developed by Yuri N. Kalachnikov at the Perm Machine Building Plant. [1] It was introduced into the Soviet Army in the early 1970s as the 2S4 Tyulpan ("Tulip"), reaching full operational status in 1975, being designated by Western intelligence as the M ...
Modern concrete mix designs can be complex. The choice of a concrete mix depends on the need of the project both in terms of strength and appearance and in relation to local legislation and building codes. The design begins by determining the requirements of the concrete.
Concrete masonry units (CMUs) or blocks in a basement wall before burial. Blocks of cinder concrete (cinder blocks or breezeblocks), ordinary concrete (concrete blocks), or hollow tile are generically known as Concrete Masonry Units (CMUs). They usually are much larger than ordinary bricks and so are much faster to lay for a wall of a given size.
In January 1994, the U.S. Army began the Medium Machine Gun Upgrade Kit program. The only two competitors were M60 and M240 versions. Saco offered an "enhanced" M60E3 with improved parts, and FN offered the M240 variant of its MAG; both weapons were upgrade kits of weapons already in service. Eighteen guns of each were tested until December 1995.
The ultimate strength of concrete is influenced by the water-cementitious ratio (w/cm), the design constituents, and the mixing, placement and curing methods employed.All things being equal, concrete with a lower water-cement (cementitious) ratio makes a stronger concrete than that with a higher ratio. [2]