Original Message:   Mechanical competence
In my experience, which admittedly may be different from many others, most AR owners either build their own or modify their own (Lego for grownups, lol).  In most cases, the popular conversation kits (CMMG for example) are as simple as removing and replacing the bolt carrier assembly which takes all of 5 seconds to complete and is part of basic cleaning of an AR.  Headspacing is not really an issue, as the chamber of a .223/5.56 barrel is designed to handle 55k/58k psi vs 24k psi for 22LR. 

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