When I shoot any of my 9mm's at the range, I just use my Peltor ears with (I think) 32 dB NRR. But when I take my .223/.5.56 AR-15 with 16" barrel, I double up my protection. I just use the orange cylinder-shaped things from Ace Hardware - made of stiff foam. I just roll it with my thumb & fingers into a little stick and cram it into my ear canal, put on my Peltors, and I'm good to go. By the time I'm ready to take my first shot, the orange things have expanded to fill my ear canal. The combination works extremely well.