Slightly longer answer. Ar15 is 5.56 mm (sort of a .223). A 7.52 mm (.308 ish)won't fit in the chamber, much less a magazine fit in the weapon. "Sort of' and "ish" because of a longer explanation about chamber pressure differences
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I did my master in physical chemistry. The pretty advanced periodic table the university bookstore sold was allowed at exam. On the other hand I memorized amino acids for some reaso