The first part of your question was tightly defined in the service rifle match code Pre-2019. In layman's terms it had to be as close as possible to a standard issue infantry rifle. With regards to an AR15, in general you could not use an actual military issue one as it would fall under the category of a restricted weapon by virtue of the lower receiver and trigger group. Ironically we can still own these, but we can't compete with the semi auto versions anymore.
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