This is a Dead Air Armament Insert, model DA432.
The Pyro is an amazing device that reduces felt recoil. However" there's times when the noise and pressure caused from a brake is not desired. Enter the Pyro Blast Cap. Install it onto your Pyro and shield the pressure away from you and those next to you. Ideal for using the Pyro in confined spaces such as indoor ranges or shoot-houses.
Features:
Ideal for when using the Pyro in confined spaces
Redirects the blast