Building an AR pistol at this time will be expensive. I would just buy one of the Carbon-15 pistols for sale on Gunbroker. I have one, they work just fine. If you want to shoot Wolf steel-cased ammo in them, it's possible, but you will have to spray-clean the chamber and keep things lubricated, or you will get spent shells that won't eject all the way. With brass ammo, there is no problem.
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