FootTapper
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However the rounds (initially) made for the SA80 (by us!) were'nt fully compatable in other 5.56 weapons & visa versa.
That's a matter of rifling - L85 and M16 have very different rifling rates, and so the ammo for each is designed to suit.
The Steyr AUG is somewhere between the two - meaning it can fire Brit and US ammo