KAL XM177 Flash Hider 1/2x28 – Clone Correct for AR-15 and Retro Builds
Not Yet Rated | Write the First Review SKU: 222-KAK-411-1702-009
UPC: 811163000000
MFG#: 411-1702-009

Complete your retro rifle the right way with the XM177 Flash Hider 1/2x28. This clone-correct muzzle device is modeled after the originals used on Colt 629, 639, 649, and GAU-5A carbines, as well as the legendary XM177E1 and XM177E2 rifles. Precision machined, phosphate finished, and true to spec, it’s the perfect piece for builders and collectors who want historical accuracy and functional performance in one package.

Why Choose the XM177 Flash Hider?

This flash hider was designed specifically for short-barrel carbines and became one of the defining features of the XM177 series. Its extended length not only reduces visible muzzle flash but also makes it ideal for pin and weld applications to bring shorter barrels into legal compliance.

• Clone-correct reproduction for XM177 and Colt carbines

• 1/2x28 threading fits standard AR-15 and 5.56 NATO barrels

• Pin & weld ready – brings short barrels to non-NFA legal length

• Durable phosphate finish for authentic military look

• Precision machined steel for long-term reliability

Features & Specifications

• Thread Pitch: 1/2x28 (standard for AR-15 / 5.56)

• Caliber Compatibility: 5.56 NATO / .223 Remington

• Material: Machined steel, heat treated for strength

• Finish: Mil-spec phosphate coating

• Length: Extended to replicate XM177 spec and support pin/weld builds

• Compatibility: Colt 629, 639, 649, GAU-5A, XM177E1, XM177E2 clones

• Weight: Approx. 4 oz

XM177 vs A1 and A2 Flash Hiders

While the A1 and A2 flash hiders became standard on later M16 rifles, the XM177 muzzle device is longer and unique to its Colt carbine lineage. If you’re building a historically accurate XM177 or GAU-5A, the A1 or A2 simply won’t do — the XM177 flash hider is the correct choice.

Who This Flash Hider Is For

• Retro AR builders creating XM177E1, XM177E2, or GAU-5A clones

• Collectors who value clone-correct parts with historical accuracy

• AR-15 owners needing a pin & weld solution for legal 16” length

• Enthusiasts who want a vintage muzzle device with functional performance

FAQ

Q: Is this XM177 flash hider clone correct?
A: Yes. It replicates the original design used on XM177E1, XM177E2, Colt 629, 639, 649, and GAU-5A carbines.

Q: Will this fit my AR-15?
A: Yes. It uses the standard 1/2x28 thread pitch common to most AR-15 and 5.56 NATO barrels.

Q: Can this be pinned and welded for legal barrel length?
A: Yes. Installed on shorter barrels, it brings the overall length to 16” or more when pinned and welded.

Q: How does this differ from the A1 and A2 flash hiders?
A: The XM177 flash hider is longer, clone-specific, and correct for Colt carbine builds, while A1 and A2 models were for standard M16 rifles.

Q: Is the finish true to the original?
A: Yes. It features a phosphate coating for an authentic, mil-spec look.

Final Thoughts

The XM177 Flash Hider 1/2x28 is the essential muzzle device for retro builders who want accuracy, legality, and history all in one part. Whether you’re finishing an XM177E2 or building a GAU-5A clone, this flash hider delivers both form and function.

👉 Add it to your build today and complete your rifle with a true clone-correct piece.