MPN: FR1 / FR1B / FR3 / FR3B


  • Does not interfere with sights
  • FLUTED for quick, tight and tooless use
  • Protect muzzle threads with muzzle device is not in use
  • Designed and made in the U.S.A.


  • Material: 416 Stainless Steel
  • Finish: Black or Matte Stainless
  • Weight: 1.25 oz.
  • Length: 0.75"
  • Diameter: 1"
  • Thread:
    • 1/2"-28 (Fits all .22 Cal barrels including .223, 5.56, .22LR)
    • 5/8"-24 (Fits all .30 Cal barrels including .308, 7.62, 300BLK)


Sometimes, you may want to remove the muzzle device from your rifle. There are a number of hazards involved when you carry a rifle with exposed muzzle threads. It’s no fun to deal with damaged or dirty threads when it comes time to mount a flash hider or brake to a gun that’s got dirty or dinged up threads. Your best bet is to apply a quality AR thread protector to keep your muzzle threads protected. Whether you need a 1/2x28 thread protector or a 5/8x24 thread protector, you can trust Custom Muzzle Brakes Stainless Steel Rifle Thread Protector to make the care of your rifle threads hassle free.

Trust a Specialist

As you might have gleaned from their name, Rex Silentium specializes in Muzzle devices so they know exactly how important it is to keep those muzzle threads in pristine condition. With that in mind, they’ve designed this stainless steel rifle thread protector to be easy to use and effective without being overly large or awkward. Its low profile stays clear of iron sights. The Rex Silentium Thread Protector is intended for tool-less application and features a fluted surface for a solid grip.

American Made Quality

Whether you need a 1/2x28 thread protector or a 5/8x24 thread protector, there is a AR Thread Protector for your application. Each one is precision machined from American Steel by Rex Silentiums’ professional craftsmen. Use a Rex Silentium Thread Protector and know you’re using the best.

Have a question?

Ask an Expert