I would go with a dedicated .22LR AR. I run a TacSol upper, on an Aero lower.
If the poop hits the fan, and I NEED another lower, I pop the pins & VOILA - instant 5.56 lower ready to go!
If the poop hits the fan, and I NEED another lower, I pop the pins & VOILA - instant 5.56 lower ready to go!

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