Running an AR-15 in 22 Long RifleSee also: 223 Remington vs 5.56mm vs 22 Long Rifle.Conversion kits vs Dedicated UpperFjold, of Calguns, brought up that the 22LR projectile is actually slightly smaller in diameter than a 223 projectile. This means that, while it will fire more or less reliably from an AR-15 barrel, there will be a degree of "slop" involved, which will greatly reduce the accuracy found by using a Ceiner or other conversion kit and a standard AR-15 barrel. It is recommended, if accuracy is even remotely of concern, to use a dedicated upper instead of a conversion kit.
22LR AR uppers
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