Description
The Luth-AR 5.5" Flash Hider is a nod to the old-school CAR-15 and XM177 Moderator look, built as a stretched-out muzzle device that runs 1/2×28 right-hand threads for .223 Remington and 5.56 NATO barrels. It's a straightforward piece of steel with a purpose: add length out front while keeping the profile clean and cutting down on visible muzzle flash. If you've ever admired those Vietnam-era Commando carbines with the long tube hanging off the front, this is the part that gives you that silhouette.
What the Luth-AR 5.5" Flash Hider Is Really For
The main draw here is length. A flash hider like this lets you take a shorter barrel and bring the overall length up without adding more barrel, which is exactly how the original moderators worked on 10.5" and 11.5" carbines. Folks running retro clones lean on the 5.5" size because it captures that classic stepped-cylinder look, and builders who want a compact setup use it to stretch things out up front. Worth noting: this one is not pre-drilled for a pin and weld, so if your project calls for that, plan accordingly.
Build Quality on the BL-55
Luth-AR makes this from 4150 steel and finishes it in manganese phosphate, which is the same rugged parkerized coating you'll find on plenty of mil-spec parts. That finish holds up to heat and weather, and it takes aftermarket paint well if you're going for an authentic milsurp look. The threads are clean 1/2×28 right-hand, so it spins right onto standard 5.56 and .223 barrels without any fuss.
Luth-AR has built a reputation for solid, affordable AR parts and complete rifles, and this flash hider fits that mold. It's an American-made piece backed by a one-year warranty, and it does exactly what it sets out to do without any gimmicks. For retro builders and anyone who wants that long-nose muzzle treatment, it's a dependable choice at a price that won't make you think twice.
Key Specifications
- Manufacturer: Luth-AR
- Manufacturer Part Number: BL-55
- UPC: 812058031680
- Caliber: .223 Rem / 5.56 NATO
- Product Type: Flash Hider
- Style: CAR-15 Moderator
- Length: 5.5 inches
- Thread Pitch: 1/2×28 Right Hand
- Material: 4150 Steel
- Finish: Manganese Phosphate
- Color: Black
- Mount Type: Threaded
- Country of Origin: Made in USA
- Warranty: One Year
What’s Included
- Luth-AR 5.5" Flash Hider (BL-55)
Frequently Asked Questions
What thread pitch does the Luth-AR 5.5" flash hider use?
It's cut for 1/2×28 right-hand threads, which is the standard for .223 Remington and 5.56 NATO barrels. That means it threads directly onto the vast majority of AR-15 muzzles without needing an adapter. Just make sure your barrel is threaded 1/2×28 and you're good to go.
Is the Luth-AR 5.5" flash hider pre-drilled for a pin and weld?
No, this one does not come pre-drilled for a pin and weld from the factory. If your build requires a permanent attachment, a gunsmith can drill and set it up for you. Otherwise, it threads on like any standard muzzle device.
Why would I want a 5.5-inch flash hider instead of a standard one?
The extra length lets you extend a shorter barrel's overall length without adding more barrel, which is the same idea behind the original CAR-15 and XM177 moderators. It's a popular choice for retro Commando-style clone builds where that long-nose silhouette is the whole point. Some builders also just like the classic look and the added weight up front.
What is the Luth-AR 5.5" flash hider made from?
It's machined from 4150 steel and finished with a manganese phosphate coating. That's the same durable parkerized treatment found on plenty of mil-spec components, so it stands up well to heat and the elements. The finish also takes aftermarket paint nicely if you want an authentic milsurp appearance.






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