I would get the highest level of blocking available. These are meant to block enough sound To prevent damage....usually cheap disposables are 29-31 dB if used correctly—however, this might be too much for someone going to a concert. Musicians who play wind instruments hate those earplugs because having everything completely sealed makes everything sound like it would with a cheap tape recorder....a flat sound with no reverberation. They make bone conducting headphones that literally vibrate the bones next to the ear—I think the sound that I hear while playing trumpet with those earplugs Is being heard the same way. Those bone conducting headphones don’t even touch the ears and you can turn them all the way up without causing hearing damage—even at levels that would cause damage with regular cans or speakers. They are kind enough like open backed cans...you can hear everything around you—there isn’t much sound leakage, and
none of them have exceptional sound quality. If I have to wear earplugs while playing, I prefer open backed cans...most of musicians at the studio only keep The regular Sony pro closed back cans that the studios use on one ear...for the click track.
Personally, I mostly use earplugs with 9, 12, or 15 dB of protection while playing. Over the course of a 3-4 hour gig, that is enough that I don’t cause permanent ear damage. If you look up the sound levels that cause hearing damage, you will see that what is safe for one minute, fifteen minutes, An hour, two hours, and four hours is different. I’ve been to movies loud enough that my ears will recover by morning, but if I where to sit in that environment for 8 hours, it would be enough that recovery would take Much longer...and that’s if I recovered... repeatedly enduring sustained loud levels of volume....without giving your ears enough time to recover in between....is probably the most common cause of hearing loss. I use 15db for nightclub or rock gigs. I use 9db for most jazz gigs. I only use them when I have brass players playing loud parts and sitting behind me for orchestra gigs.
I would at least wear the cheap plugs around 30db, and I would consider using them along with over the ear protection. Over The Ear protection is mostly what I’ve seen at the gun range. The things you see professional lawn crews or someone working outside around the planes at an airport.
There are some models that have built in am/fm radios, 2.5” inputs, and even bluetooth... if you have a pair of Bose QC35 or Sony XM3 over ear cans, I think both of them offer around 33 dB of noise isolation—not as much as actual over ear protection, but probably enough.
Over ear protection creates a better seal and are more protective than any in ear plugs, and it’s much easier to be sure that they are being worn correctly. Another idea is to wear a pair of over the ear cans...something with good noise isolation, regardless of if they are noise canceling.
Guns are so loud that even the short bursts put out enough pressure to cause damage. If you did wear these, I would only do it in combination with over ear protection as secondary protection.