Does as advertised. - Dead Air Armament E-Brake

I won't comment on the nature of it's effect on sound, sound direction and recoil, etc. I will leave that to you to consider. The item is designed to thread into the endcap threads of the suppressor. You remove the endcap and install the cap on the end of the E-Brake that is seen in the photo. The square sided and knurled surface on the back of the E-Brake in the photo is NOT part of the E-Brake but rather that is the tool needed to remove the endcap from your suppressor and install it on the end of the E-Brake. It has four pins to fit into your endcap. The rear of the E-Brake looks to be closed off down to at least the size of the 30 caliber endcap, so it doesn't really "open up" the front end of the suppressor. I just wanted to point out this in the review as it was hard to find info on it.