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The CMMG Resolute MK4 in 300 Blackout is built for folks who want a short, quick-handling AR-15 without stepping into short-barrel territory. It starts with a 14.5" barrel and finishes with CMMG's ZEROED SVD muzzle brake pinned and welded on, which pushes the permanent overall barrel length to 16.1". You get the handling of a stubby carbine while keeping things simple, and there's no pistol brace or tube to fuss with. This upper arrives assembled and ready to drop onto any standard AR-15 lower.
The barrel is 4140 chrome moly steel with a salt bath nitride treatment inside and out, so it holds up to heat and moisture over the long haul. A 1:7 twist rate keeps everything stable, which matters a lot with 300 Blackout since the round covers such a wide range of bullet weights. That twist is the sweet spot for running both light, fast supersonic loads and the heavy subsonic pills that make this cartridge shine when you're shooting suppressed.
300 BLK was designed around the AR platform from the ground up, so it feeds and cycles like it belongs there. This upper is right at home in close quarters and still reaches out farther than a pistol-length setup ever could. Wrapped around the barrel is CMMG's EML M-LOK free-float handguard, giving you slots at the 3, 6, and 9 o'clock positions plus a top rail section for optics, lights, lasers, and whatever else you like to hang on your build.
One thing worth knowing up front: this upper group ships without a bolt carrier group or charging handle. That's the norm for CMMG's upper groups and it lets you spec those parts to match your budget and taste. Grab a quality 300 BLK bolt carrier group and a charging handle, snap it onto your lower, and you're shooting. The billet aluminum receiver wears a tough matte black Cerakote finish, and like the rest of the CMMG lineup, it's backed by the company's lifetime quality guarantee.
No, this upper group ships assembled but without a BCG or charging handle. That's standard for CMMG upper groups and lets you choose those parts to fit your build. You'll want to add a 300 BLK bolt carrier group and a charging handle before it's ready to run.
The barrel itself measures 14.5 inches, but CMMG pins and welds the ZEROED SVD muzzle brake permanently in place, which extends the overall length to 16.1 inches. This gives you the compact feel of a short barrel while keeping the setup simple. The brake stays put permanently since it's welded on.
Yes, it's built to pair with any standard AR-15 lower receiver. Just add your BCG and charging handle, snap it onto your lower, and you're good to go. It uses the same mil-spec upper-to-lower fit you'd expect on the platform.
It's one of the best cartridges out there for it. The 1:7 twist barrel stabilizes the heavy subsonic loads that pair so well with a suppressor, and it handles supersonic ammo just as easily. That versatility is a big part of why the 300 BLK cartridge is so popular on short AR builds.
| UPC | 810148622008 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 30BD30A-AB |
| Barrel Finish | MATTE BLACK |
| Barrel Length | 14.5" |
| Caliber/Gauge | .300 AAC Blackout |
| Color | Black |
| Length | 14.5'' |
| Style | Assembled |
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