The SureFire SOCOM300-SPS black suppressor is a Fast-Attach can built for .300 BLK/Whisper (7.62×35) subsonic and supersonic ammunition (SureFire part no. SOCOM300SPSBK). SureFire calls it the quietest suppressor it has ever designed, and its highly specialized V-shaped baffles are tuned first for subsonic ammunition while virtually eliminating first-round flash and dust signature. An oversized but precision-machined bore lowers the chance of a baffle strike from an unstable projectile. The body is Inconel alloy and stainless steel, CNC laser-welded, and SureFire notes it is also very capable on 5.56mm hosts. It is aimed squarely at short .300 Blackout carbines with barrels of 10 inches or less, where a quiet subsonic setup matters most.

Key Specifications

• SureFire lists the caliber as 7.62mm, .308 and .300 Blackout, with the baffles optimized for .300 BLK/Whisper ammunition.
• It is optimized for .300 BLK carbines with 10-inch or shorter barrels, the hosts on which SureFire rates it quietest.
• Overall length is 7.9 inches, a length SureFire chose for stronger signature reduction.
• Length added to the weapon is 5.4 inches, and the actual figure varies with the SureFire adapter used.
• Diameter is 1.5 inches, the standard SOCOM body size for handguard clearance.
• Weight is 20 ounces, worth factoring into the balance of a short carbine.
• Construction is high-temperature alloy and stainless steel, CNC laser-welded for durability.
• The finish is Ionbond and Cerakote in black, a hard coating that protects the housing.
• Flash suppression is rated at up to 99.5 percent of visible flash, with first-round flash virtually eliminated.
• It mounts with the Fast-Attach design, compatible with SureFire’s Fast-Attach flash hiders, compensators and WARCOMPs.

Frequently Asked Questions

How quiet is the SOCOM300-SPS? SureFire publishes 133 dB with Sig 125-grain OTM and 126 dB with BH 220-grain OTM from a 5.5-inch barrel, plus 132 dB with M118 LR from a 25-inch barrel, all measured at the shooter’s ear.

Can I use it on a 5.56 rifle? SureFire says the SPS is also very capable in 5.56mm applications, though its baffles are optimized for .300 BLK/Whisper subsonic and supersonic ammunition.

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.

Buy the SureFire SOCOM300-SPS .300 Blackout 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 silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer. Pair it with a subsonic .300 Blackout load and a short barrel, and it delivers the quiet setup the cartridge was designed for.