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It appears that this round can drastically improve the performance of any AR-15 weapon chambered to .223/5.56 mm. Superior accuracy, wounding capacity, stopping power and range have made this the preferred round of many special forces operators, and highly desirable as a replacement for the older, Belgian-designed 5.56×45mm SS109/M855 NATO round.
4.6×30mm – PDW; 5.45×39mm [2] – intermediate; 5.56×45mm NATO – Original M16A1 cartridge: Can also safely fire .223 Remington, intermediate [2]; FN 5.7×28mm – PDW; 6mm Mongoose (wildcat)
A worker at Lake City Army Ammunition Plant packs two cans of newly manufactured 5.56×45mm NATO ammunition into a wirebound crate. (c. 1998) Headstamp of a .50 caliber cartridge casing made at the Lake City Army Ammunition Plant in 1943 and recovered from the Sahuarita Bombing and Gunnery Range in 2012.
The table below gives a list of firearms that can fire the 5.56×45mm NATO cartridge, first developed and used in the late 1970s for the M16 rifle, which to date, is the most widely produced weapon in this caliber. [1]
Initial comments by Springfield Armory test staff were favorable, and some testers commented that the AR-10 was the best lightweight automatic rifle ever tested by the Armory. [43] In the end, the U.S. Army chose the T44, now named the M14 rifle, [37] which was an improved M1 Garand with a 20-round magazine and automatic fire capability.
The ArmaLite AR-18 is a gas-operated rifle chambered for 5.56×45mm NATO ammunition.The AR-18 was designed at ArmaLite in California by Arthur Miller, Eugene Stoner, George Sullivan, and Charles Dorchester in 1963 as an alternative to the Colt AR-15 design, a variant of which had just been selected by the U.S. military as the M16.
This means that although they both use the same parent case, the 277 WLV has more powder capacity, which is a benefit when trying to achieve the best possible velocity when using the lighter super-sonic bullets (24.5 gr of water in an unloaded case for the 300 BLK, 27.6 gr for the .277 WLV)
With a fast-firing gun using standard rifle ammunition, the US Army and US Air Force showed interest for use of the XM214 on aircraft, helicopters, and armored vehicles. The smaller and lighter Microgun could replace the Minigun on heavily armed gunship aircraft and attack helicopters, freeing up space for ammo, equipment, and even more guns.