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KAK Industry built the K-SPEC enhanced bolt around one simple goal: cleaner, more consistent ejection without giving up strength or forcing you to hunt down oddball parts. It fits 5.56/.223 and 300 Blackout AR-15 platforms and slides into any standard direct impingement carrier, so whether you're finishing a fresh build or upgrading an existing setup, this bolt plays nice with the parts you already own.
The headline feature is the dual ejector system. Instead of one ejector fighting to kick brass out, two ejectors work together for a more predictable ejection pattern and better reliability across a range of ammo and gas settings. KAK didn't reinvent the wheel here either. The system runs Mil-Spec ejectors and springs, which means no proprietary components to track down when it's time for maintenance. What makes the design smart is that the ejector holes are centered on the bolt lugs, so you get the twin-ejector benefit without carving strength out of the bolt face.
This is a serious piece of machining. The bolt is cut from 9310 steel with outside diameters ground to .0002 tolerances, then shot peened and magnetic particle inspected (MPI) to catch any flaws before it ever leaves the shop. The extractor is fully machined 4140 steel, the extractor pin is heat-treated S7 tool steel, and the whole thing wears a phosphate finish for wear and corrosion resistance. It's the kind of attention to detail that shows up as reliability downrange.
KAK has been making dual ejector bolts for the AR-10/LR308 world for over a decade, and they carried that hard-earned know-how into the AR-15 K-SPEC line. Everything is produced 100% in-house in Missouri using Doosan machining centers, Tsugami Swiss turning, and automated CMM inspection, which keeps quality consistent bolt to bolt. If you run a suppressor or just want your rifle throwing brass to a tidy pile instead of scattering it, this is a straightforward, well-made upgrade that fits right in.
Yes. The K-SPEC bolt is backwards compatible with all standard Mil-Spec BCG components and drops into any AR-15 style direct impingement carrier. You can pair it with a KAK carrier or one from another maker without issues. Keep in mind this listing is the bolt only, not a complete BCG.
Two ejectors working together give you a more consistent ejection pattern and better reliability compared to a single ejector, which is especially handy when running a suppressor or mixing ammo and gas settings. KAK centered the ejector holes on the lugs so you get that benefit without weakening the bolt. It's a system they refined over a decade on their AR-10/LR308 bolts.
No. The dual ejector setup runs standard Mil-Spec ejectors and springs, so there's nothing proprietary to source when it's time for cleaning or replacement. That keeps long-term maintenance simple and inexpensive.
It is. The bolt is designed to run both 5.56/.223 and 300 Blackout since those cartridges share the same bolt face, making it a solid choice if you swap uppers or run multiple calibers off one lower. The 9310 steel construction, shot peening, and MPI testing back up its durability across both.
| UPC | 811163035743 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MO-303-0502-011 |
| Color | Black |
| Model | |
| Product Type | Bolt Action |
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