This is a Aero Precision MB known as the Epsilon chambered in 308 Winchester, model APVG100021A.
Designed for the discriminating shooter and professional end-users" VG6 Precision's EPSILON affords you the best muzzle control and recoil mitigation the industry has to offer. Its performance is matched only by the amazing look of this device.
Features:
Recoil compensation
Flash signature mitigation
Heat Treated Stainless Steel