The “ping” is not that loud so you have to be fairly close to hear it and GIs generally are not alone. Moving to get the “one” places you in the sights of the others.
The clip makes more noise bouncing on the cement - if you're on a range - than the system does as it ejects the clip.
I like shooting my Garand and have been on the range a few times with a number of others. While you can hear your own weapon's “ping” and a table or two to either side it's hard to hear the “ping” four or five tables over.
-—and of course, the “ping” is of little or no consequence noise-wise when you have just fired 8 rounds of ‘06’s-—