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Building or maintaining an AR-15 chambered in .224 Valkyrie or 6.8 SPC means you need a bolt carrier group that matches the .422 case head those cartridges share. This KAK Industry BCG is cut for exactly that job, running the correct bolt face so your rifle chambers, fires, and extracts the way it should. It's the workhorse of KAK's carrier group lineup, and it earns that reputation by keeping things simple and getting the fundamentals right.
The carrier is machined to the M16 full-auto profile from aircraft and bearing quality 8620 steel, then heat treated, precision ground, and given a chrome-lined phosphate finish that fights corrosion and makes cleanup easy. The bolt itself is machined from a single piece of 9310 steel, shot peened, and MPI tested so you know the material is sound before it ever gets to your rifle. The firing pin is turned to mil-spec print from 8740 steel and chrome plated, and the one-piece billet extractor is phosphate coated for reliable grab on the case rim. Little touches like the S7 tool steel ejector and extractor pin, plus a 4130 gas key that's precision staked, round out a group that's put together to run.
Think of this as a straightforward drop-in for a caliber-specific build or a solid replacement if your current bolt has seen enough rounds. The M16 profile adds a touch of mass for consistent cycling, and it works whether you're punching paper at distance with a Valkyrie or chasing hogs with a 6.8. One thing worth mentioning: this bolt face is specific to the .422 head size, so it won't cross over to 6.5 Grendel or standard .223 builds. Match it to a .224 Valkyrie or 6.8 SPC barrel and you're set.
KAK Industry has been turning out American-made parts at fair prices since 2011, and everything here reflects that focus on durable, no-frills components you can count on.
Yes. Both cartridges use the same .422 case head, so this bolt carrier group is built to run either one without swapping parts. It also covers 6.8 SPC II and similar cartridges based on that case. Just make sure your barrel is chambered for one of those calibers.
No. The .224 Valkyrie and 6.8 SPC share a .422 bolt face, while 6.5 Grendel uses a larger PPC-based head and .223/5.56 uses a smaller one. This BCG is specific to the Valkyrie and 6.8 case head, so it won't interchange with those other calibers. Match it only to a .224 Valkyrie or 6.8 SPC barrel.
The M16 full-auto profile is fully legal and common on semi-auto rifles. It carries a little more mass than a carbine-cut carrier, which many builders like for smoother, more consistent cycling. It bolts right into a standard AR-15 upper with no modifications needed.
Yes. The bolt is machined from a single piece of 9310 steel, shot peened, and magnetic particle inspected (MPI) to help confirm the material is free of hidden flaws. KAK also runs in-house CMM inspection on their bolts. That combination gives you good peace of mind for a hard-use build.
| UPC | 811163035040 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 425-0512-019 |
| Color | Black |
| Model | |
| Product Type | Bolt Carrier Group |
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