Made from 17-4 Stainless Steel, we designed the Thumper to be effective and durable. You can attach this device to your Remington, Winchester, Mossberg, Browning or Beretta and it will make a great Thumper for those applications where you need the sound of a suppressor. There is a small tab on the side of the Thumper that you can sound with your stock or aftermarket suppressors. There are 2 plastic rings that come with the Thumper that you can use to sound your suppressor. The Thumper has 2 oz slug weights so lets you decide what sounds the best!