I typically double up on ear protection. I tried electronics and I felt they could not match the NR of the non electronics that I use; especially at indoor ranges. The 3M Optime with inner ear pro works great for me. They make indoor shooting extremely pleasant. I initially thought that doubling ear pro would give me the NRR benefit of both pairs ie. 23nrr+ 30nrr would give me 53 NRR, but from what I understand this is not the case. You only get the benefit of the highest NRR and +5 for the lower, so 23nrr+30nrr=35NRR. I may try electronics again in the future, but what I have now works really well. Aks are still loud they just don't hurt my ears.