SureFire SF3P556MK46 5.56 NATO Flash Hider & Suppressor Adapter, 9/16"-24 tpi, Black Nitride Steel

The SureFire SF3P556MK46 is a dual-purpose 5.56 NATO flash hider and suppressor adapter built for shooters who want to run either solo or suppressed without changing muzzle devices. With its iconic three-prong design, this flash hider handles the concussive signature of .223/5.56 rounds effectively in unsuppressed fire—valuable on the range or in the field where flash signature matters. The 9/16"-24 thread pitch is the mil-spec standard for modern AR platforms, making this a straightforward fit for any 5.56 upper with that thread pattern.

What sets this piece apart is the adapter function built into the prongs themselves. When you're ready to run suppressed, the prongs accept SureFire suppressors with the matching quick-detach mount, letting you transition between configurations without swapping the entire muzzle device. That means no re-zeroing between suppressed and unsuppressed shooting—a huge time-saver for serious shooters juggling multiple rigs or ammo types.

SureFire's black nitride finish resists corrosion and wear, holding up through heavy use and variable weather. The three-prong design is proven across military and law enforcement platforms, meaning it's battle-tested geometry you can count on. If you're building or upgrading an AR in 5.56 and want a flash hider that gives you the option to suppress later without replacing hardware, this adapter covers both roles in one piece.

Key Features

• Dual-function 5.56 NATO flash hider and quick-detach suppressor adapter
• Iconic three-prong design proven in military and professional use
• 9/16"-24 tpi thread pitch (mil-spec standard for 5.56 uppers)
• Black nitride steel construction for corrosion and wear resistance
• Accepts SureFire suppressors with quick-detach compatibility
• No re-zeroing required when transitioning between suppressed and unsuppressed fire

Specifications

Frequently Asked Questions

Will this fit my 5.56 AR-15?

Yes, provided your barrel is threaded 9/16"-24 tpi, which is the military-standard thread pitch for 5.56 rifles. Most modern AR uppers in that caliber use this spec. If you're unsure, check your barrel's thread pitch before ordering.

What suppressors work with this adapter?

This device accepts SureFire suppressors equipped with the quick-detach mount. It's not compatible with other suppressor brands or non-QD models. Verify your suppressor's attachment style before assuming compatibility.

Do I have to re-zero my rifle if I switch between suppressed and unsuppressed shooting?

No. Because the flash hider and suppressor adapter are integrated into one fixed muzzle device, your zero point remains constant whether you run suppressed or unsuppressed. The suppressor mounts on the same reference point, eliminating the shift that occurs when swapping muzzle devices.

Is this a direct drop-in replacement for my current flash hider?

Only if your current device uses the same 9/16"-24 thread pitch. This adapter simply screws onto barrels with that specification. If you're replacing a different thread pitch (such as 1/2"-28), you'll need a muzzle device designed for that pattern instead.