Suppressors are often known for their recoil mitigating properties. The E-Brake tames the recoil further by acting as a brake at the end of your silencer. It's a quick and simple way to get even more performance from your silencer. - The E-Brake provides added recoil reduction while also providing a more diffused venting of the high-pressure gases escaping the front of the suppressor. The vent holes allow for a softer release than other offerings on the market so there's less dust kicked up when shooting prone and it doesn't burn the ears of bystanders. - Available in two different widths they share the same R-Series front cap thread pitch as our Sandman Series Nomad Series Wolverine and Wolfman. The only choice you have to make is what diameter you want. - The 1.735 diameter fits flush with our Nomad Series while the 1.5 diameter is a perfect width for our Sandman Series and Wolverine. - They are cross-compatible so don't think too hard about it. Many people like the wider diameter on their Sandman as they report it helps keep their suppressor cover from sliding forward. For those that don't have that problem go with what looks best to you as their functionality is identical. - Install is easy. Just remove your existing front cap and install it on the front of the E-Brake then thread the E-Brake onto your silencer. Next enjoy a flatter shooting rifle.