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After all this...do you realize how silly this sounds? In the AR 15 platform, the .223 5.56 is one of THIS MANY
.17 Mach 2
.17 HMR[1]
.17 Winchester Super Magnum[1]
.22 Long Rifle[2]
.22 Winchester Magnum Rimfire[1]
.17 Mach IV
.17 Remington Fireball
.17 Remington[1]
.204 Ruger[1]
.222 Remington
.223 Remington - Original AR-15 caliber: .223 cartridges may function in a 5.56×45mm rifle, however 5.56×45mm cartridges can produce excessive pressure in a .223 rifle. On the other hand, a .223 Wylde chamber is used on .223 caliber rifle barrels to allow them to safely fire either .223 Remington or 5.56x45mm NATO ammunition.[3]
.22 PPC
.22 Nosler
.224 Valkyrie (necked down 6.8SPC) [4]
.223 Winchester Super Short Magnum[3]
.243 Winchester Super Short Magnum[3]
.25 Winchester Super Short Magnum[3]
.25-45 Sharps
.277 Wolverine (6.8×39mm)
.30 Carbine[1]
.30 Remington AR[5]
300 OSSM[3]
300 AAC Blackout (7.62×35mm)[5]
.300 Whisper[5]
358 Yeti - Wildcat [6]
375 SOCOM
.40 S&W[7]
.410 Shotgun
.45 ACP[8]
.450 Bushmaster[1]
.458 SOCOM[9]
.50 Action Express
.50 Beowulf[10]
5.45×39mm[1]
5.56×45mm NATO - Original AR-15A2 caliber: can also safely fire .223 Remington[1]
FN 5.7×28mm
6.5mm Grendel[1]
6.8×39mm (.277 Wolverine)[11][12]
6.8mm Remington SPC[5]
7.62×37mm Musang
7.62×39mm[5]
7.62×40mm Wilson Tactical[5]
7.92x33mm Kurz
9mm Parabellum[2]
10mm Auto[8]
And then there is the AR 10 category...
.220 Swift
.22-250 Remington
6mm-250
.243 Winchester - same bolt as 7.62×51 (worn-down barrels can be re-bored to take 6.5 Creedmoor or 7.62×51)[3]
6MM Remington
6MM Creedmoor
257 Roberts
6.5×47mm Lapua
6.5mm Creedmoor - same bolt as 7.62×51, and can be formed from 7.62×51 brass
.260 Remington - same bolt as 7.62×51, and can be formed from 7.62×51 brass
7mm-08 Remington
7.62×51mm NATO - Original AR-10 caliber
.308 Winchester - considered interchangeable with 7.62×51mm NATO according to SAAMI.
.338 Federal
.358 Winchester
.45 RAPTOR
.500 Auto Max
.300 Winchester Magnum [13][14][15]
.30-06 Springfield [16]
7mm Remington Magnum[17]
.270 Winchester[18]
.25-06 Remington[18]
.338 Lapua Magnum[19]
.17 Mach 2
.17 HMR[1]
.17 Winchester Super Magnum[1]
.22 Long Rifle[2]
.22 Winchester Magnum Rimfire[1]
.17 Mach IV
.17 Remington Fireball
.17 Remington[1]
.204 Ruger[1]
.222 Remington
.223 Remington - Original AR-15 caliber: .223 cartridges may function in a 5.56×45mm rifle, however 5.56×45mm cartridges can produce excessive pressure in a .223 rifle. On the other hand, a .223 Wylde chamber is used on .223 caliber rifle barrels to allow them to safely fire either .223 Remington or 5.56x45mm NATO ammunition.[3]
.22 PPC
.22 Nosler
.224 Valkyrie (necked down 6.8SPC) [4]
.223 Winchester Super Short Magnum[3]
.243 Winchester Super Short Magnum[3]
.25 Winchester Super Short Magnum[3]
.25-45 Sharps
.277 Wolverine (6.8×39mm)
.30 Carbine[1]
.30 Remington AR[5]
300 OSSM[3]
300 AAC Blackout (7.62×35mm)[5]
.300 Whisper[5]
358 Yeti - Wildcat [6]
375 SOCOM
.40 S&W[7]
.410 Shotgun
.45 ACP[8]
.450 Bushmaster[1]
.458 SOCOM[9]
.50 Action Express
.50 Beowulf[10]
5.45×39mm[1]
5.56×45mm NATO - Original AR-15A2 caliber: can also safely fire .223 Remington[1]
FN 5.7×28mm
6.5mm Grendel[1]
6.8×39mm (.277 Wolverine)[11][12]
6.8mm Remington SPC[5]
7.62×37mm Musang
7.62×39mm[5]
7.62×40mm Wilson Tactical[5]
7.92x33mm Kurz
9mm Parabellum[2]
10mm Auto[8]
And then there is the AR 10 category...
.220 Swift
.22-250 Remington
6mm-250
.243 Winchester - same bolt as 7.62×51 (worn-down barrels can be re-bored to take 6.5 Creedmoor or 7.62×51)[3]
6MM Remington
6MM Creedmoor
257 Roberts
6.5×47mm Lapua
6.5mm Creedmoor - same bolt as 7.62×51, and can be formed from 7.62×51 brass
.260 Remington - same bolt as 7.62×51, and can be formed from 7.62×51 brass
7mm-08 Remington
7.62×51mm NATO - Original AR-10 caliber
.308 Winchester - considered interchangeable with 7.62×51mm NATO according to SAAMI.
.338 Federal
.358 Winchester
.45 RAPTOR
.500 Auto Max
.300 Winchester Magnum [13][14][15]
.30-06 Springfield [16]
7mm Remington Magnum[17]
.270 Winchester[18]
.25-06 Remington[18]
.338 Lapua Magnum[19]