AR-15 6.8 SPC Magazines

With the AR-15 gaining in popularity with many sport shooters and those just wishing to exercise their Second Amendment rights, a variety of different chamberings have been developed for the AR 15 platform in recent years. Some of these various AR15 calibers have fizzled while others have flourished. The 6.8 SPC was developed due to some deficiencies in the 5.56 NATO cartridge, and although the 6.8 SPC has not taken off as a service round as some would have liked, it has gained a solid following in the civilian world and units within the US Military.

A good read from the 6.8 Wiki:

The 6.8 mm Remington SPC (aka 6.8 SPC, 6.8 SPC II & 6.8×43mm) is a rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Unit, United States Special Operations Command[4] to possibly replace the 5.56 NATO cartridge in a Short Barreled Rifle(SBR)/Carbine.

Based upon the .30 Remington cartridge,[5] it is midway between the 5.56×45mm NATO and 7.62×51mm NATO in bore diameter and muzzle energy. It uses a .277" (7.0358 mm) diameter bullet, the same as that used in the venerable .270 Winchester hunting cartridge. It is particularly adaptable to current 5.56 mm NATO firearms, sharing the same cartridge overall length (2.260").

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