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The CMMG Resolute MK4 Upper Group takes the guesswork out of building a .350 Legend rifle. It's a complete AR-platform upper that mates to any standard AR-15 lower, and it arrives ready to run with a 16.1-inch barrel, an EML15 M-LOK free-float handguard, a full bolt carrier group, and CMMG's ZEROED accessory suite. If you've been wanting a semi-auto whitetail gun without sourcing a dozen separate parts, this is about as close to plug-and-play as an upper gets.
Winchester introduced the .350 Legend in 2019 as a fast straight-walled cartridge built for deer hunters who need one, and it hits well above its weight. It carries respectable energy out to roughly 200 yards on whitetail, which covers the vast majority of real-world shots in the timber and across fields. Recoil is famously mild, often compared to being softer than a .243 Winchester, which makes this a great choice for younger hunters, smaller-framed folks, or anyone who just doesn't enjoy a beating at the bench. It runs on the standard AR-15 platform, so you get semi-auto follow-up shots and familiar controls.
Construction is serious. The barrel is 4140 chrome moly steel with a salt bath nitride finish for solid accuracy and long wear, spun with a 1:16 twist that's tuned for common .350 Legend hunting loads. The muzzle is threaded 1/2×28 and wears a CMMG ZEROED muzzle brake to keep things flat for quick follow-ups. Up front, the EML15 free-float handguard puts M-LOK slots at 3, 6, 9, and 12 o'clock so you can hang a light, sling, or bipod exactly where you want it, while trimming weight compared to older full-rail designs. It runs a direct impingement system with a carbine-length gas port and a 0.750-inch gas block.
Installation is straightforward: pop it onto a mil-spec lower, run the correct .350 Legend magazines, and you're set. The included ZEROED polymer dust cover and ambidextrous charging handle round out the package, and the whole thing is backed by CMMG's lifetime guarantee against material and workmanship defects. It's a clean way to add a dedicated deer setup to your collection without building from a bare receiver.
Yes. It's built to mate with any standard mil-spec AR-15 lower group, so it drops right on and pins up like a typical upper. Just make sure you're running the correct .350 Legend magazines, since the round is straight-walled and uses its own mags rather than standard 5.56 ones.
It's a whitetail and hog cartridge at heart, with plenty of punch on deer-sized game out to roughly 200 yards. The 16.1-inch barrel balances maneuverability with velocity, and the mild recoil makes it easy to shoot well. Most real-world shots in the woods and across fields fall comfortably inside its effective range.
It does. The upper ships complete with a bolt carrier group, a ZEROED ambidextrous charging handle, and a ZEROED polymer dust cover, plus the ZEROED muzzle brake up front. That means you won't be chasing down a pile of small parts to get it running once it's on your lower.
Absolutely. The EML15 free-float handguard has M-LOK slots at the 3, 6, 9, and 12 o'clock positions for lights, slings, and bipods, and the receiver's flat top gives you a solid platform for an optic or red dot. The free-float design also helps keep your accessories from putting pressure on the barrel.
| UPC | 810097502635 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 35B5FBCAB |
| Action | |
| Barrel Length | 16.1" |
| Caliber/Gauge | .350 Legend |
| Color | Black |
| Model | |
| Product Type | Upper |
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