In 2011 The Freedom Group and Advanced Armament Corporation (AAC) announced the .300 AAC Blackout, a standardized commercial version of the .300 Whisper. Whisper’s built after 1999 were dimensionally identical to the .300 Blackout and are fully interchangeable; however, the latter features a .015-inch longer chamber throat.
The new GMT-300 is a simple, two piece suppressor with titanium G-Core. This new titanium construction provides a quiet and easily cleanable suppressor. Functions with 300 Blackout supersonic or subsonic only. A direct mount to 5/8-24 threads allows for a rigid and secure attachment.