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5.56/.223 not as necessary.... All the other calibers, it is a small expense for a very expensive/dangerous failure.

99.9% of all AR-15 parts are made to be within a certain spec (hence the term Mil-Spec). The problem is that there is no "Mil-Spec" for the other calibers. The 308AR has so many different variants that it is really hard to guarantee you'll be ok. If your barrel maker is +0.005" and your bolt maker is -0.005", then you will be off by 0.01" and that is a BIG red light. Take advantage of the barrel maker headspacing for you. If there are ever any issues with that later on, they'll take care of you better.

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