Maxim Defense Industries DSX-D, Suppressor, 556NATO, Grade 5 Titanium, DLC Coating, Black, 21oz MXM-48354 Duty built for the world's most rigorous demands, this suppressor is designed to be the most robust and strongest suppressor in category. It has been repeatably tested with SOCOM tables across a variety of calibers and barrel lengths, down to 8.5" 5.56 NATO with M855 ball ammunition, and has survived with no damage or significant changes in sound reduction