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Bill Wylde of Greenup, Illinois, compared the two cartridges and changed the chamber of the rifle's barrel to a specification he called the .223 Wylde chamber. The chamber is made with the external dimensions and leade angle found in the military 5.56×45mm NATO cartridge and the 0.2240 in (5.69 mm) freebore diameter found in the civilian SAAMI.
The .223 Wylde chamber specification developed by Bill Wylde solves this problem by using the external dimensions and lead angle as found in the military 5.56×45mm NATO cartridge and the 0.224 inch freebore diameter as found in the civilian SAAMI .223 Remington cartridge.
.223 Remington – Original AR-15 cartridge: .223 cartridges may function in a 5.56×45mm rifle, however 5.56×45mm cartridges may produce excessive pressure in a .223 Rem rifle. On the other hand, a .223 Wylde chamber is used on .223 Rem rifle barrels to allow them to safely fire either .223 Remington or 5.56×45mm NATO ammunition. [6]
The AR-15 is nominally chambered in .223 Remington or 5.56×45mm NATO, with the .223 Wylde chamber allowing for the safe chambering of both, but many variants have been produced in different calibers such as .22 LR (sometimes referred to as an AR-22 [59]), 7.62×39mm, 9×19mm Parabellum, [60] 6.5mm Grendel, and shotgun calibers. [61]
The .223 Remington (.223 Rem) is a cartridge with almost the same external dimensions as the 5.56×45mm NATO military cartridge No, they are exactly the same case dimension. Digitallymade 08:31, 1 March 2017 (UTC) Actually the dimensions of the cartridge are the same. The article later says there is no such thing as 223 or 5.56 brass.
[21] [22] Fourteen of the firearms were .223-caliber AR-15-type semi-automatic rifles: three manufactured by Colt, two by Daniel Defense, two by FN Herstal, two by LWRC International, two by POF-USA, one with a .223 Wylde chamber by Christensen Arms, one made-to-order by LMT, and one by Noveske.
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Firing a 5.56×45mm NATO round out of a rifle chambered in .223 Remington could be injurious or fatal to the user as well as the gun, however .223 Remington ammunition can be fired safely from almost any rifle chambered in 5.56×45mm NATO as the NATO specified rifles can handle much higher chamber pressures than the .223 Remington is capable of ...