What size thread protector fits an AR-15?

Most AR-15 barrels use a 1/2x28 thread pitch. This is the standard size for .223/5.56 barrels and is compatible with most AR-15 thread protectors.

Do thread protectors require timing or crush washers?

No. AR-15 thread protectors screw on flush and do not require timing, shims, or washers. They are hand-tightened and non-directional.

Are these compatible with .308 or AR-10 barrels?

Yes, we also offer 5/8x24 thread protectors, which are compatible with most .308, AR-10, and 300 Blackout barrels.

AR-15 Thread Protector – 1/2x28 & 5/8x24 Barrel Covers

Name: AR-15 Thread Protector
Brand: Mounts Plus
Availability: InStock

1/2 x 28 Thread Protector

**EGW Barrel Thread Protector Stainless Steel 5/8 X 24** $14.24

**EGW Barrel Thread Protector Stainless Steel 1/2 X 28** $14.24

**EGW Barrel Thread Protector Carbon Steel 5/8 X 24** $14.24

**EGW Barrel Thread Protector Carbon Steel 1/2 X 28** $14.24

**Yankee Hill Qd Mount Thread Protector** $28.13

**Yankee Hill Srx Thread Protector Blk** $40.00

**Yankee Hill 9mm Pist Thr Prot 1/2x28 .570 Od** $28.13

**Yankee Hill 308 Rfl Thr Prot 5/8x24 .920 Od** $28.13

**Yankee Hill 308 Rfl Thr Prot 5/8x24 .725 Od** $28.13

**Yankee Hill 22/556 Rfl Thr Prot 1/2x28 .730** $28.13

**Yankee Hill 22/556 Rfl Thr Prot 1/2x28 .920** $28.13

**Backup Thread Protector 223rem Frag Blk** $30.48

**Backup Thread Protector 1/2x28 Frag Blk** $28.91

**Backup Thread Protector 223rem Hcmb Blk** $30.48

**Backup Thread Protector 1/2x28 Cyl Blk** $28.91

**Backup Thread Protector 1/2x28 Sklx Blk** $28.91

**Backup Thread Protector 1/2x28 Hcmb Blk** $28.91

**Backup Thread Protector 1/2x28 Cyl Sil** $28.91

**Backup Thread Protector 1/2x28 Hash Blk** $28.91

**Backup Thread Protector 1/2x28 Flag** $28.91

**Grovtec Thread Prtctr 300blk 5/8-24** $14.00

**Grovtec Thread Protector Pstl 1/2-28** $14.00

**Grovtec Thread Protector 1/2-28 X.625** $14.00

AR-15 Thread Protector – 1/2x28 & 5/8x24 Barrel Thread Covers

Protect your rifle’s barrel threads and maintain a sleek profile with a precision-made AR-15 thread protector. Whether you're swapping muzzle devices, storing your firearm, or shooting without a brake or suppressor, a thread protector prevents damage to your crown and threads—ensuring long-term barrel integrity.

At Mounts Plus, we carry a selection of USA-made thread protectors for AR-15 and other threaded-barrel rifles. Available in popular thread pitches like 1/2x28 and 5/8x24, these protectors are machined from durable materials, finished with corrosion-resistant coatings, and built for secure fitment on standard barrels.

Why Use an AR-15 Thread Protector?

✅ Prevents Thread Damage – Protects exposed threads when no muzzle device is attached
✅ Cleans Up Your Build – Offers a finished look on naked or minimalist muzzle setups
✅ Ideal for Storage & Transport – Avoids thread wear when rifles are cased or moved
✅ Suppressed or Brake-Free Builds – Perfect for shooters who don’t use muzzle devices
✅ Low-Cost, High-Impact Upgrade – Easy protection that extends barrel life

Thread Protector Options

Thread Pitch	Compatibility	Finish Options
1/2x28	AR-15 (.223/5.56)	Black Oxide, Stainless, FDE
5/8x24	AR-10 (.308)	Black Oxide, Stainless
Metric Sizes	9mm / PCC builds	Select models available

All protectors are knurled or fluted for easy hand tightening and removal.

🛠 How to Install

Installing your AR-15 thread protector takes seconds:

Remove your muzzle brake or suppressor
Hand-thread the protector onto your barrel
Tighten until snug—no tools needed

✅ That’s it. You're now protecting your threads from impact, carbon fouling, and accidental damage.

⭐ Customer Reviews

“Simple but critical.”
“I run suppressed most of the time, but when I don’t, this thread protector goes on. Keeps things clean and damage-free.” – Kyle R.

“Perfect fit, great finish.”
“Matched my barrel perfectly. Threads on tight, doesn’t loosen up after a few range sessions.” – Aaron G.

🧠 FAQs – AR-15 Thread Protector

Q: What is the standard AR-15 thread size?
A: Most AR-15 barrels are threaded 1/2x28, especially in 5.56 and .223 chamberings. Always verify your barrel specs before ordering.

Q: Will this fit an AR-10 or .308 rifle?
A: Yes, but you'll need a 5/8x24 thread protector, which we also carry.

Q: Does the thread protector require timing or shims?
A: No. Thread protectors are not directional and simply screw on flush until hand-tight. No crush washers or timing required.

Shop AR-15 Thread Protectors at Mounts Plus

Whether you're protecting your threads between suppressor swaps or just want a cleaner look for your build, the AR-15 thread protector is a must-have accessory. Easy to install, low cost, and built to last—it's the upgrade every rifle deserves.

In stock now. Multiple sizes and finishes available. Fast U.S. shipping.

Order your AR-15 thread protector today and protect your barrel investment.