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WMD Guns built its name on coatings, and this complete 300 Blackout upper is where all that metallurgy know-how shows up in one package. The whole assembly wears WMD's proprietary NiB-X nickel boron finish, a treatment that runs harder than chrome with a slickness that sits close to Teflon. In plain terms, that means less wet lube, easier cleaning after a range day, and a surface that shrugs off rust and the weather. It drops onto any mil-spec lower with the two takedown pins, so you can build out a 300 BLK rifle without chasing individual parts or wrestling with barrel nuts and a vise.
The heart of it is a match-grade 16-inch barrel chambered in .300 AAC Blackout, which is the sweet spot length for running full-power supersonic loads and staying legal-length without an SBR headache. It ships wrapped in a 15-inch free-float M-LOK handguard, giving you a long stretch of top Picatinny rail and plenty of M-LOK real estate along the sides and bottom for lights, bipods, hand stops, and sling points. The included NiB-X coated bolt carrier group means the assembly is ready to run right out of the box.
300 Blackout was designed from the ground up to run in the AR-15 platform using standard 5.56 magazines and the same bolt, so this upper feeds and cycles like your existing setup while throwing a heavier .30-caliber projectile. It's a favorite for hog hunting, home-defense builds, and anyone who wants to run a suppressor with subsonic ammo. Pair it with a quality mil-spec lower and you've got a hard-hitting, low-maintenance rig.
One word of caution worth repeating: never load .300 BLK into a 5.56 rifle. The rounds can chamber, but the bore is too small for the .30-caliber bullet and the results are ugly. Keep your 300 BLK mags marked and separate, and this upper will treat you right for a long time.
Yes. It's built to drop onto any mil-spec AR-15 lower receiver using the standard front pivot and rear takedown pins. No special armorer's tools or vise needed, just line it up and pin it on.
It does. This is a complete assembly, so the NiB-X coated bolt carrier group is included and ready to run. You'll just need a lower with a working charging setup and a magazine to start shooting.
NiB-X is WMD's proprietary nickel boron coating that runs harder than chrome with an extremely low friction surface. That translates to easy cleaning, minimal lubrication, and strong corrosion resistance. Carbon fouling wipes off with far less scrubbing than a standard phosphate finish.
Absolutely, and that's one of the big draws of 300 Blackout. The cartridge was designed to run both supersonic and subsonic loads, and the 16-inch barrel handles suppressed subsonic ammo well. Just confirm your muzzle threading matches your suppressor mount before setting it up.
| UPC | 854839008818 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 1-NIBXUA300BO-16 |
| Barrel Length | 16" |
| Caliber/Gauge | .300 AAC Blackout |
| Color | Nickel |
| Product Type | Upper |
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