SureFire SF3P556 5.56 NATO Flash Hider & Suppressor Adapter, 1/2"-28 TPI, Stainless Steel, Black Nitride

The SureFire SF3P556 is a 5.56 NATO flash hider and suppressor adapter built for shooters who need serious muzzle flash reduction paired with a clean, dependable mounting surface for sound suppressors. Threaded 1/2"-28 TPI, this precision-machined muzzle device delivers the flash-hiding performance SureFire is known for while serving double duty as a fast-attach platform for SOCOM Series suppressors. Whether you're running a rifle on the range, in the field, or in duty use, the SF3P556 gives you a single, durable component that handles both jobs.

Built from U.S. mill-certified, heat-treated stainless steel with black nitride coating, the SF3P556 is engineered to shrug off environmental wear, corrosion, and the fouling that comes with heavy use. The three-prong design isn't just for looks—those robust tines are shaped to manage gas dynamics while the precision geometry of the mounting surfaces keeps your suppressor rock-solid and aligned. Every unit ships inspected for concentricity and critical dimensions, so you're getting a consistent, reliable interface every time.

The SF3P556 mounts all SureFire SOCOM Series Fast-Attach suppressors and does so without requiring permanent modifications to your rifle. The adapter integrates labyrinth seals to reduce gas leakage at the suppressor lock ring, and the single-point cut threads ensure a tight, predictable fit. If you're building a 5.56 rifle with suppressor plans, this adapter eliminates the need for a separate flash hider and incompatible mounting hardware.

Important compatibility note: SOCOM Series Fast-Attach suppressors, adapters, and brakes are not compatible with earlier SureFire Fast-Attach models. Verify your suppressor's SOCOM designation before purchasing.

Key Features

• Advanced three-prong design reduces muzzle flash by more than 99%
• Serves as fast-attach adapter for all SureFire SOCOM Series suppressors
• U.S. mill-certified, heat-treated stainless steel construction resists corrosion and erosion
• Black nitride coating for durability in harsh conditions
• Multiple bearing surfaces ensure superior suppressor alignment and prevent tine ringing
• Precision-cut 1/2"-28 TPI threads for optimum interface
• Labyrinth seals reduce gas leakage from suppressor lock ring
• Factory inspected for concentricity and alignment
• Installs without permanent rifle modifications

Specifications

Frequently Asked Questions

Will this adapter work with my current SureFire suppressor?

The SF3P556 is compatible exclusively with SureFire SOCOM Series Fast-Attach suppressors. It is not compatible with previous-generation SureFire Fast-Attach suppressors, muzzle brakes, or flash hiders. Verify your suppressor is labeled as SOCOM Series before purchasing.

What 5.56 rifles can I use this on?

The SF3P556 fits any 5.56 NATO rifle or upper receiver with a barrel threaded 1/2"-28 TPI. No permanent modifications to your firearm are required for installation.

Does this flash hider work without a suppressor attached?

Yes. The SF3P556 functions as a standalone flash hider and will reduce muzzle flash by more than 99% on its own. When you add a SOCOM Series suppressor, it provides the mounting interface and maintains suppressor alignment.

What finish is this device, and how does it hold up to corrosion?

The SF3P556 is machined from heat-treated stainless steel and finished with black nitride coating, both of which resist corrosion and erosion from powder residue and environmental exposure. The nitride finish also simplifies cleaning after heavy use.