.30 Remington AR
Encyclopedia
The .30 Remington AR cartridge was created in 2008 by Remington Arms
Remington Arms
Remington Arms Company, Inc. was founded in 1816 by Eliphalet Remington in Ilion, New York, as E. Remington and Sons. It is the oldest company in the United States which still makes its original product, and is the oldest continuously operating manufacturer in North America. It is the only U.S....

. It is a rebated rim cartridge designed to fit Remington's R-15 semiautomatic hunting rifle. It was designed to fit the dimensional constraints of the AR-15
AR-15
The AR-15 is a lightweight, 5.56 mm, air-cooled, gas-operated, magazine-fed semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation. It is manufactured with the extensive use of aluminum alloys and synthetic materials....

 magazine and is based on a modification of the .450 Bushmaster
.450 Bushmaster
The .450 Bushmaster is a rifle cartridge developed by Tim LeGendre of LeMag Firearms LLC, and licensed to Bushmaster Firearms International for production and distribution. LeGendre still retains ownership of the concept...

, which in turn was based on the .284 Winchester
.284 Winchester
The .284 Winchester is an example of a commercially rather unsuccessful cartridge that has enjoyed a resurgence in interest due to interest from long-range competitive shooters...

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