Daniel Defense Barrel Thread Protector, 5/8×24

Product Description

The Daniel Defense Barrel Thread Protector, 5/8×24 is a muzzle thread protector cut for 5/8×24 threads – the pitch found on most .30-calibre AR-pattern barrels – and it threads onto a bare muzzle to keep the threads undamaged when no muzzle device or suppressor is fitted.

The job is simple and worth doing. Muzzle threads sit at the most exposed point on the rifle, and a flattened thread crest is enough to stop a suppressor or a brake from seating square against the shoulder. A protector is cheap insurance for a rifle that spends time in a safe, a truck or a soft case between muzzle devices.

We are publishing less here than on most of our pages. What we can state for this part number is the brand and the thread pitch its own name specifies: 5/8×24. Material, finish, length, diameter and weight are a phone call rather than a guess.

Key Facts

• Brand: Daniel Defense
• Model: Barrel Thread Protector
• Thread pitch: 5/8×24
• Manufacturer Part Number / SKU: 06-088-09438
• Material, finish, length, diameter and weight: call 817-393-4000 to confirm – we will not state specifications we cannot verify for this part number

Checking your muzzle thread first

5/8×24 and 1/2×28 are not interchangeable. If your barrel came off a 5.56 upper it is most likely 1/2×28; .308, 7.62 NATO and many 300 Blackout barrels use 5/8×24. Barrels are often marked, and a thread gauge settles it in seconds otherwise. Browse our muzzle devices if you would rather fit a brake or flash hider, our barrels section, or suppressors if the threads are there for a can.

Ordering from Western Sport in Roanoke, TX

Western Sport is a licensed FFL/SOT dealer in Roanoke, Texas since 2007 and a Daniel Defense master dealer, so we order this part direct. It is on backorder; call 817-393-4000 and we will confirm the specifications and place it. Our gunsmith can check your thread pitch while you wait.

Frequently Asked Questions

Q: What thread does this protector fit?

A: 5/8×24 – a 5/8 in. diameter muzzle thread at 24 threads per inch. That is the pitch used on most .30-calibre AR-pattern barrels, including .308 and 7.62 NATO barrels and many 300 Blackout barrels. Check the marking on your barrel or measure the threads before ordering.

Q: Will it fit a 1/2×28 muzzle?

A: No. 1/2×28 is the common 5.56 thread and is both a smaller diameter and a different pitch, so a 5/8×24 protector will not start on it. Forcing a mismatched thread protector is how muzzle threads get damaged. If your barrel is 1/2×28, call 817-393-4000 for the right part.

Q: Why run a thread protector at all?

A: Because exposed muzzle threads are fragile and they are the last thing on the rifle to hit a door frame, a rack or the bed of a truck. A dinged thread can stop a suppressor or brake from seating square, which matters for both accuracy and safety.

Q: What material and finish is it?

A: We are not going to state a material, finish, length or outside diameter for this part number, because we would be guessing. Call 817-393-4000 and we will confirm the physical specifications with Daniel Defense before you order rather than publish a number we cannot stand behind.

Q: Do I need a crush washer or shim with it?

A: A thread protector is not a muzzle device that needs timing, so it does not normally need a crush washer to index ports. Most thread over the shoulder and snug down. Torque practice varies by barrel and shoulder condition, so if you want it done properly our gunsmith can fit it.

Q: Can I leave it on under a handguard or a suppressor cover?

A: That depends on the outside diameter of the protector and the clearance in your handguard, which is exactly the dimension we will not guess at. Tell us your handguard and barrel profile on 817-393-4000 and we will check clearance before the order goes in.

Additional information