The VG6 CAGE (Concussion Altering Gas Expansion) device is one of the top devices for concussion reduction technology. Compatible with the Gamma 556, Epsilon 556, and Epsilon AK devices, the primary goal is to disrupt side concussion without hindering the characteristics of the Gamma 556 and Epsilon 556, and AK devices. A close wrap fit allows the CAGE to disburse gasses conductive to muzzle control and concussion disruption. Made from high quality stainless steel with a black Nitride finish Compatible with the VG6 Gamma 556 and Epsilon 556, and Epsilon AK Weighs 1.4 oz The VG6 CAGE delivers extremely smooth recoil and zero muzz Mfg: Vg6 Precision