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The KAK Plan B A2 Flash Hider keeps the muzzle profile every AR shooter grew up with, but it's built to do more than just tame flash. Instead of relying on plain threads alone, KAK machined a taper into the base of the hider that seats against a matching taper on the barrel or adapter, so every time you thread it on you get the same solid, centered lockup. That matters a lot if you're running a suppressor off this thread interface, since any wobble or inconsistency in fit translates directly into accuracy loss and uneven wear on your can.
This flash hider is designed specifically to pair with Plan B suppressor hubs, which use that same taper-to-thread design to create a tight metal-to-metal seal rather than just relying on a shoulder and washer. Once torqued down correctly, you get a mount that comes back to zero every time you swap the can on and off, which is the whole point of running a quick-detach style suppressor mount in the first place.
KAK cut this one from 17-4 stainless steel and finished it in black nitride, so you're getting a part that resists corrosion and holds up to the heat cycling that comes with regular range time. It measures 1.850 inches overall and weighs in at 2.5 ounces, keeping the classic A2 birdcage shape intact so it doesn't throw off the balance or look of your build. The .375 inch bore diameter and 5/8×24 threads make it a natural fit for .308 Win and 7.62×51 NATO barrels, and the 3/4 inch flats on the rear give your wrench something solid to grab onto during installation.
KAK recommends using Rocksett on the threads and torquing to 20-25 ft-lbs for a permanent, repeatable install. This isn't a device you want to just hand-tighten and call it done, since a loose flash hider on a suppressor host thread can walk under recoil and throw off your mount's timing. If you're running this with a suppressor from another manufacturer, it's worth checking their documentation first, since some companies only warranty their cans when paired with their own brand of muzzle device.
The .375 inch bore is sized for .308 Winchester and 7.62×51 NATO barrels, along with other cartridges that fall within that bore diameter. It's a common choice for AR-10 platform rifles running 5/8×24 threads. Always double check your barrel's thread pitch and bore size before ordering to make sure it lines up.
Yes, KAK specifically recommends Rocksett along with 20-25 ft-lbs of torque for a proper, permanent install. The taper-and-thread design needs that solid lockup to seal correctly and stay timed, especially if you're running a suppressor off it. Skipping the thread locker can lead to the hider loosening up over time under recoil.
This flash hider is built around the Plan B mounting system, so it's meant to pair with suppressor hubs that use that same taper design. It should work fine as a standalone flash hider on any 5/8×24 barrel even without a suppressor. If you're planning to run a can, just confirm your suppressor uses or accepts a Plan B style mount.
It's machined from 17-4 stainless steel and finished with a black nitride coating, which holds up well against heat and corrosion from regular firing. That combination is pretty standard for muzzle devices that see a lot of heat cycling. The finish also keeps it matched up visually with most black hardcoat or nitride finished barrels.
| UPC | 811163036276 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MO-411-2103-006 |
| Caliber/Gauge | .308 / 7.62 NATO |
| Color | Black |
| Model | |
| Product Type | Flash Hider |
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