Quoted: What other calibers can I shoot with the AR15 platform?
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If you can name it there is probably an AR upper out there for it.
Off the top of my head (this is just the AR-15 platform - there are more for the AR-10)
.50 BMG, .50AE, .50 Beawulf, .50 SOCOM, .499 LW, .458 SOCOM, .30 Whisper, .30 HRT, 7.62x39, 7x45, 7mm Whisper, 7mm PPC, 7mm TCU, 6.8SPC, 6.5 Grendle, 6.5 Whisper, 6.5PPC, 6mm PPC, 6x45, 5.7x28, .25 WSSM, .243WSSM, 5.56/.223, .223 WSSM, .222 Remington, .222 Remington Magnum, .221 Genghis (aka 5.45x39), .221 Fireball, .204 Ruger, .20 Tactical, .22LR, .17 Remington, .17 Mach II
10mm, .45 ACP, .44Mag, .44 AutoMag, 9mm, .357 Auto, .357 Magnum, 7.62x25
.54 Blackpowder (only one made as far as I know)
Before we get into the AR-10 will one of the above suffice?
Edited to add the 5.7 P-90 round & the WSSM cartridges