List of AR platform cartridges The AR platform has become widely popular for makers of military and sporting rifles. Although the designations "AR-10" and "AR-15" are respectively trademarks of ArmaLite and Colt , variants of both are made by many manufacturers. The rifle comes in 2 calibers, the military caliber of 5.56 X 45 or the equivalent.223. Because of the pressures associated with the 5.56mm, it is inadvisable to fire 5.56mm in an AR-15 marked.223 and can result in damage to the rifle or injury to the shooter. The AR-15 can be converted to other calibers; it is then referred to as an AR-15 Style Rifle .AR-15 calibers Rimfire calibers .17 Mach 2 .17 HMR .17 Winchester Super Magnum .22 Long Rifle .22 Winchester Magnum Rimfire .17 Mach IV .17 Remington Fireball .17 Remington .17-223 .20 Practical .20 GPC .204 Ruger .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 5.56×45mm NATO ammunition. .22 GPC .22 PPC .22 Nosler .224 Valkyrie .224 Kritzeck .223 Winchester Super Short Magnum .243 LBC .24 GPC .243 Winchester Super Short Magnum .25 Winchester Super Short Magnum .25-45 Sharps .257 ocelot .25 GPC .26 GPC .277 Wolverine .27 GPC .28 GPC .30 GPC .30 Carbine .30 Remington AR 30 American 300 OSSM 300 AAC Blackout .300 Whisper .30 sabertooth .350 Legend 300 HAM'R - Wilson Combat 358 Yeti - Wildcat 375 SOCOM .40 S&W .45 ACP .450 Bushmaster .458 SOCOM .499 LWRC .50 Action Express .50 BeowulfCenterfire calibers metric measurement 5.45×39mm 5.56×45mm NATO - Original AR-15A2 caliber: can also safely fire.223 Remington FN 5.7×28mm 6mm mongoose 6mm ARC 6mm AR 6×45mm 6.5mm Grendel 6.5 Timberwolf 6.8×39mm 6.8mm Remington SPC 7mm Valkyrie 7.62×37mm Musang 7.62×39mm 7.62×40mm Wilson Tactical 7.92x33mm Kurz 9×19mm Parabellum 10mm Auto 9×39mm Calibers which will not feed but which are used in rifles where the receiver functions only as a trigger group .338 Lapua Magnum .408 CheyTac .50 BMG .220 Swift .22-250 Remington 6mm-250 .243 Winchester - same bolt as 7.62×51 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 6.5 WSM .260 Remington - same bolt as 7.62×51, and can be formed from 7.62×51 brass .270 Winchester Short Magnum 7mm-08 Remington - same bolt as 7.62×51, and can be formed from 7.62×51 brass 7.62×51mm NATO - Original AR-10 caliber 7mm Winchester Short Magnum 7mm Remington Short Action Ultra Magnum .308 Winchester - considered interchangeable with 7.62×51mm NATO according to SAAMI. .300 Winchester Short Magnum .300 Remington Short Action Ultra Magnum .325 Winchester Short Magnum .338 Federal - same bolt as 7.62×51, and can be formed from 7.62×51 brass .338 Winchester Short Magnum .358 Winchester - same bolt as 7.62×51, and can be formed from 7.62×51 brass .358 Winchester Short Magnum .375 Raptor - same bolt as 7.62×51, and can be formed from 7.62×51 brass .375 Winchester Short Magnum .416 Winchester Short Magnum .450 Marlin .45 Raptor 45-70 Auto .458 Winchester Short Magnum 475 Bishop Short Magnum .50 Krater .500 Auto Max .500 Phantom .500 Whisper .510 Whisper .510 Winchester Short MagnumOther AR pattern rifles Some companies have created AR pattern rifles that depart from the standard AR-15 and AR-10 dimensions in order to accommodate other types of ammunition that would not fit into the those standards. Examples include :Cartridge Overall length 7.5×55mm Swiss 6.5×55mm .25-06 Remington 7mm Remington Magnum .270 Winchester .458 Winchester Magnum .300 Winchester Magnum .30-06 Springfield .338 Lapua Magnum
Other AR pattern firearms A variety of manufacturers have introduced semiautomatic shotguns whose overall designs are heavily influenced by the AR pattern rifle.
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