Kak Industry194201229
KAK PLAN B A7 FH 1/2X28 .223-9mm$58.45
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Availability: In Stock
Current Stock: Out of stock
The Kak Industry XM177 FH Clone Correct 1/2x28 is a retro-spec muzzle device built for shooters who want authentic XM177 moderator aesthetics on modern AR-15 builds. With an integrated grenade ring and extended profile, this 1/2x28 threaded device captures the distinctive look of the Vietnam-era XM-177 line while serving real practical purposes—it can extend a 12.5" barrel to legal rifle length when pin and welded, and it pairs seamlessly with a crush washer hidden inside the grenade ring counter bore so nothing shows once installed.
If you're building a clone-correct rifle (whether a Colt 639, 649, 619, 620, or dedicated XM177/177E1/177E2 platform), this Kak muzzle device gives you the historically accurate silhouette without added complexity or loose parts. The heat-treated phosphate coating handles the elements and use, and the design philosophy keeps the build simple—no extra hardware to manage or track.
This is a straightforward choice for builders and collectors who care about correct specs: whether you're restoring a vintage rifle concept or building a purpose-built clone rifle that looks and functions period-correct, the XM177 FH delivers that aesthetic with genuine utility.
| Brand | Kak Industry |
| Product Type | Muzzle Device / Flash Hider |
| Thread Pattern | 1/2x28 |
| Overall Length | 4.678" |
| Finish | Heat-treated phosphate coat |
| Design | XM-177 moderator clone-correct |
| Compatible Platforms | Colt 619, 620, 639, 649; XM177, 177E1, 177E2 |
When pin and welded to a 12.5" barrel, this device's extended length brings the overall rifle to legal non-NFA length. However, pin-and-weld legality and barrel length rules vary by jurisdiction—check your local and federal firearms regulations before modifying your barrel.
This muzzle device is 1/2x28 threaded, the standard pattern for most AR-15 platforms. Verify your barrel's thread pitch before purchase.
The crush washer is not included with the muzzle device. However, the design includes a counter bore in the grenade ring that houses a crush washer, so once installed the fastener remains hidden.
The integrated grenade ring and extended profile replicate the appearance and geometry of the original XM-177 moderator, making it purpose-built for historically accurate builds of Colt 639, 649, 619, 620 and XM177-series rifles.
SKU: 167514491 • Width: 1.25in • Height: 1.25in • Depth: 5.75in • Weight: 8oz
Availability: In Stock
Current Stock: Out of stock
The Kak Industry XM177 FH Clone Correct 1/2x28 is a retro-spec muzzle device built for shooters who want authentic XM177 moderator aesthetics on modern AR-15 builds. With an integrated grenade ring and extended profile, this 1/2x28 threaded device captures the distinctive look of the Vietnam-era XM-177 line while serving real practical purposes—it can extend a 12.5" barrel to legal rifle length when pin and welded, and it pairs seamlessly with a crush washer hidden inside the grenade ring counter bore so nothing shows once installed.
If you're building a clone-correct rifle (whether a Colt 639, 649, 619, 620, or dedicated XM177/177E1/177E2 platform), this Kak muzzle device gives you the historically accurate silhouette without added complexity or loose parts. The heat-treated phosphate coating handles the elements and use, and the design philosophy keeps the build simple—no extra hardware to manage or track.
This is a straightforward choice for builders and collectors who care about correct specs: whether you're restoring a vintage rifle concept or building a purpose-built clone rifle that looks and functions period-correct, the XM177 FH delivers that aesthetic with genuine utility.
| Brand | Kak Industry |
| Product Type | Muzzle Device / Flash Hider |
| Thread Pattern | 1/2x28 |
| Overall Length | 4.678" |
| Finish | Heat-treated phosphate coat |
| Design | XM-177 moderator clone-correct |
| Compatible Platforms | Colt 619, 620, 639, 649; XM177, 177E1, 177E2 |
When pin and welded to a 12.5" barrel, this device's extended length brings the overall rifle to legal non-NFA length. However, pin-and-weld legality and barrel length rules vary by jurisdiction—check your local and federal firearms regulations before modifying your barrel.
This muzzle device is 1/2x28 threaded, the standard pattern for most AR-15 platforms. Verify your barrel's thread pitch before purchase.
The crush washer is not included with the muzzle device. However, the design includes a counter bore in the grenade ring that houses a crush washer, so once installed the fastener remains hidden.
The integrated grenade ring and extended profile replicate the appearance and geometry of the original XM-177 moderator, making it purpose-built for historically accurate builds of Colt 639, 649, 619, 620 and XM177-series rifles.
SKU: 167514491 • Width: 1.25in • Height: 1.25in • Depth: 5.75in • Weight: 8oz