It’s already been downgraded to just 20 shots fired:
*If* that was an AR-15 then that means the guy was probably taken down when he ran out of cartridges in his one clip. When he was changing out clips was a great time to neutralize him. Let’s hope that’s what happened.
They are called magazines and are also available in 30 round counts also. Love those P-mags! For lawful use only.
Standard magazine for an AR-15 type is 30 these days. Hasn’t been 20 in a very long time.