The Kak Industry Retro AR Extended Flash Hider is a 6-inch muzzle device built around the classic XM-177 Moderator profile—a design that works as well today as it did decades ago. If you're running a 10.5" barrel and need to bring your overall rifle length into compliance with non-NFA regulations, this flash hider handles the job when pin and welded. It's the straightforward solution for short-barreled builds that demand a period-correct look without sacrificing legality.

The extended 6-inch length is purpose-built to extend short barrels to legal overall length when permanently installed. The 1/2x28 thread pitch fits standard 5.56 NATO/.223 Remington platforms, and the muzzle device itself is milled with heat-treated phosphate coating for durability in hard use. The design includes pre-drilled holes at .125 inch for pin and weld installation, making it straightforward for a gunsmith to secure it permanently to your barrel.

This is a no-frills, functional piece: the retro profile appeals to builders going for an authentic 1960s–70s aesthetic, but the engineering is modern. You're getting a serious muzzle device that does what it's supposed to do—help manage flash signature while extending your barrel legally. Bear in mind that a crush washer is not included, so factor that into your assembly plan.

Key Features

• 6-inch overall length extends 10.5" barrels to legal non-NFA compliance when pin and welded
• 1/2x28 thread pitch for standard 5.56 NATO/.223 platforms
• Heat-treated phosphate-coated steel with milled flats for durability
• Pre-drilled for secure pin and weld installation
• XM-177 Moderator–inspired retro profile

Specifications

Brand	Kak Industry
Product Type	Extended Flash Hider
Overall Length	6.15 inches
Thread Pitch	1/2x28
Material	Heat-treated phosphate-coated steel
Design	XM-177 Moderator profile
Installation	Pin and weld (pre-drilled)
Crush Washer Included	No

Frequently Asked Questions

Will this flash hider make my 10.5" barrel legal length?

When pin and welded, the 6.15-inch extended flash hider will extend a 10.5" barrel to overall legal length for non-NFA compliance. Pin and weld is a permanent installation that requires a qualified gunsmith; once installed, the muzzle device becomes part of the barrel.

What thread pitch does this fit?

This muzzle device is threaded 1/2x28, which is standard for 5.56 NATO/.223 Remington platforms and most AR-15 rifles in those calibers.

Is a crush washer included?

No, a crush washer is not included. You'll need to source one separately for installation.

Can I use this on any AR-15?

This extended flash hider is designed for barrels threaded 1/2x28. If your barrel has a different thread pitch (such as 5/8x24 for .308 platforms), this device will not fit.