Description
The CMMG Endeavor 300 MK4 350 Legend, 16″ Barrel, Bronze is a modern sporting rifle chambered in the hard-hitting 350 Legend cartridge. It’s built on CMMG’s proven radial-delay blowback system for a softer recoil impulse than a standard direct blowback AR, housed in a sleek, feature-rich upper receiver with a durable bronze Cerakote finish. I’ve put a few hundred rounds of Winchester and Hornady through this platform, and it’s a flat-shooting, versatile rig that bridges the gap between an AR-15 and a larger-caliber hunting rifle.
Key Features
- Radial-Delay Blowback Operation: Smoothes out recoil, reduces bolt velocity, and increases reliability.
- 350 Legend Chambering: A straight-walled cartridge offering excellent terminal performance for hunting within specific state regulations.
- 16″ Barrel with 1:16 Twist: Optimized for stabilizing a wide range of 350 Legend projectiles.
- Bronze Cerakote Finish: Provides a durable, corrosion-resistant coating that looks sharp and holds up to field use.
- MK4 Upper Receiver: Features an integrated full-length Picatinny rail and an ambidextrous forward assist.
- M-LOK Handguard: Lightweight and offers plenty of real estate for mounting lights, grips, and other accessories.
Specs & Details
| Caliber | 350 Legend |
|---|---|
| Barrel Length | 16 inches |
| Twist Rate | 1:16 |
| Operation | Radial-Delay Blowback |
| Finish | Bronze Cerakote |
| Handguard | M-LOK |
This is an upper receiver assembly, not a complete firearm. It’s designed to mate with a standard mil-spec AR-15 lower receiver—think Aero Precision, PSA, or any other quality forged lower you might have. The beauty here is that it’s drop-in ready; you just need to pair it with your existing lower, a bolt carrier group, and a charging handle. The price point of $1482.56 reflects the advanced engineering in the radial-delay system and the premium finish. It ships with one 20-round magazine, which is a nice touch right out of the gate.
Who This Rifle Is For
This CMMG Endeavor is perfect for the Missouri hunter in a straight-walled cartridge state who wants the ergonomics and familiarity of an AR platform for deer or hog. It’s also a great choice for a shooter who wants a potent, fun-to-shoot rifle for the range that has more punch than 5.56 but less cost and recoil than 300 Blackout. If you already have an AR lower and want to quickly configure a dedicated hunting rig, this upper makes it simple.
Pros & Cons
Pros: The radial-delay system is the real deal—it genuinely tames the 350 Legend’s snap. The fit and finish are top-tier CMMG. The 350 Legend ammo is relatively affordable and effective. The platform’s modularity means you can tailor the stock, trigger, and grip on your lower to your exact preference.
Cons: As an upper-only, you need a complete lower to use it, which adds to the total cost. The 350 Legend, while growing, doesn’t have the vast ammo selection of 5.56. Some might find the 16″ barrel a tad long for tight brush, but it’s a great balance for velocity and maneuverability.
Frequently Asked Questions
Q: Will this upper work on my existing AR-15 lower?
A: Yes, absolutely. The CMMG Endeavor 300 MK4 upper is compatible with any standard mil-spec AR-15 lower receiver. You’ll need to use a standard AR-15 charging handle and a .350 Legend specific bolt carrier group, which CMMG can provide.
Q: Is the 350 Legend a good deer hunting round in Missouri?
A: It’s an excellent choice where straight-walled cartridges are required for hunting. The 350 Legend delivers strong, ethical terminal ballistics on deer-sized game within reasonable ranges, making this CMMG setup a very capable and modern hunting tool.
Q: What’s the main advantage of the radial-delay system?
A: It fundamentally changes the recoil feel. Instead of the sharp, direct blowback impulse, it’s a smoother, delayed push. This means less perceived recoil, faster follow-up shots, and theoretically less wear on components over time. You feel the difference on the first shot.
Look, if you’re after a high-quality, soft-shooting 350 Legend upper that’s ready to hit the woods or the range without any fuss, the CMMG Endeavor 300 MK4 is a standout option. It’s available at firearms-missouri.com for Missouri residents and nationwide. FFL transfer required for firearm purchases. Check the full product details to see if it’s the right fit for your next build.
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