The SureFire SOCOM300-SPS Black is a Fast-Attach suppressor for .300 Blackout and .300 Whisper (7.62×35) rifles and carbines (SureFire part no. SOCOM300-SPS-BK). SureFire calls it the quietest suppressor in its family, with highly specialized V-shaped baffles tuned for subsonic ammunition that virtually eliminate first-round flash and dust signature. The bore is oversized yet precision machined, which lowers the chance of a baffle strike from an unstable projectile. It is optimized for .300 BLK carbines with barrels of 10 inches or shorter, and SureFire notes it is also very capable in 5.56mm applications. This black version suits a dedicated suppressed .300 Blackout build.

Key Specifications

• The rated calibers are 7.62mm, .308 and .300 Blackout, as SureFire lists them for this suppressor.
• It is optimized for .300 BLK/Whisper (7.62×35) with both subsonic and supersonic ammunition.
• Overall length is 7.9 inches, sized for signature reduction on short .300 BLK carbines.
• SureFire lists 5.4 inches of length added to the host weapon, though the actual figure depends on the adapter used.
• Diameter is 1.5 inches, the figure to check against handguard clearance.
• Weight is 20 ounces, a real figure to factor into a short-barreled build.
• Construction is high-temperature Inconel alloy and stainless steel, CNC laser-welded for strength.
• The coating is Ionbond and Cerakote, and this version is Black.
• The mount is Fast-Attach, which attaches and removes without tools and works with SureFire flash hiders, compensators and WARCOMPS.
• The bore is oversized but precision machined, which decreases the baffle strike probability from unstable projectiles.

Frequently Asked Questions

Can I shoot supersonic ammunition through it? Yes. SureFire optimizes the SOCOM300-SPS for .300 BLK/Whisper (7.62×35) subsonic and supersonic ammunition, with baffles specifically designed for subsonic loads.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

What comes with the suppressor? The SOCOM300-SPS comes with a FirstSpear MOLLE pouch and a cleaning brush.

Buy the SureFire SOCOM300-SPS Fast-Attach .300 BLK Suppressor, Black

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through SureFire‘s suppressors lineup and our Lubbock, Texas team will handle the transfer and it ships fast to your Class 3 dealer. The SPS is the quietest suppressor SureFire makes, which is the reason to pick it for a subsonic .300 Blackout rifle.