Apex Grade Thread Protector for FN 545 & FN 510

This thread protector is a direct-fit replacement or spare component for factory-threaded barrels on the FN 545 Tactical and FN 510 Tactical. It prevents thread damage during storage, transport, or holster use. The captured O-ring stays in place when the protector is removed, eliminating the common loss of a loose seal ring. Available in bead-blasted (white) or Armorlube (black) finish.

Platform Compatibility

• FN 545 Tactical (factory threaded barrel, .578-28 tpi)
• FN 510 Tactical (factory threaded barrel, .578-28 tpi)
• Any pistol barrel with .578-28 thread pitch and approximately .515” shoulder-to-muzzle length

Key Features

• Unique offset pentagon pattern for visual differentiation from standard round protectors
• Pre-installed captured O-ring stays retained in the protector when removed
• Bead-blasted (white) or Armorlube (black) finish options
• Direct thread-on installation, no fitting required
• Protects .578-28 tpi threads from impact, debris, and holster wear

Install Difficulty

1 out of 5 — hand-tighten onto clean, dry barrel threads. No tools required. Verify O-ring is seated before first use. Torque to 15-20 in-lbs if using a wrench, but hand-tight is sufficient for standard carry/storage.

FAQ

Will this fit a suppressor?

This is a thread protector, not a suppressor mount. It replaces the factory protector or covers the threads when a suppressor is not installed. The captured O-ring seals against the barrel shoulder to prevent loosening.

Does the O-ring stay in the protector or on the barrel?

The O-ring is captured inside the thread protector and remains in place when the protector is removed from the barrel. It will not fall out or stick to the barrel threads.

What finish should I choose?

Bead-blasted (white) matches stainless or raw steel barrels. Armorlube (black) matches black nitride or DLC finishes. Both are corrosion-resistant. Choose based on your barrel color.

Ships within one business day. Limited lifetime warranty against manufacturing defects. Returnable within 30 days if unused and in original packaging.