I was a bit skeptical, but I have a M92 Yugo PAP, and saying that it is concussive is a massive understatement. A 9" barrel, with 7.62x39 is....loud. Sounded like a howitzer, and, while the recoil was very mild, the concussion made it uncomfortable to shoot for long. I swapped out the flash hider that I'd been using, I figured, if this didn't work, it wasn't expensive, but the change was unbelievable. It went from tooth-rattling, to merely loud. It didn't modify the volume at all, but the concussion and pressure from the blast were all pushed forward, away from me. I love it, and it's staying until I adapt my M92 for suppressed shooting.