Get Ready For The Blackout. The SureFire SOCOM300-SPS is the answer for .300 BLK/Whisper (7.62 x 35) subsonic and supersonic ammo users seeking superior levels of sound attenuation from a precision-built suppressor. It’s also very capable in 5.56 mm and 300 WM applications. The SPS features highly specialized, V-shaped baffles that promote the utmost in sound suppression for subsonic ammunition while virtually eliminating first-round flash and dust signatures. Constructed of Inconel alloy and stainless steel, and CNC laser-welded, it’s stealthy without sacrificing an ounce of strength. Go ahead. Make it rain.