Look at the NRR. The cheap electronics run about 21 dB, that is not enough unless you double plug and maybe not then. Hearing protection and good electronics cost money. I have Peltors now, will likely get Pro Ears Magnums at 33 dB, $319 list price when I need replacements. Those $300 Sordins are only 18 dB, which is leaving you almost wide open to muzzle blast.