First Impressions of Rock River Arms Carbine .350 Legend Completed Upper
The Rock River Arms Carbine .350 Legend Completed Upper promises to bring the hard-hitting, straight-walled cartridge performance of the .350 Legend to the AR-15 platform, offering a compelling option for hunters in states with restrictive regulations and shooters looking for a versatile, close-to-mid-range caliber. With its 16-inch barrel, free-float handguard, and included bolt carrier group, this upper aims to be a straightforward upgrade, ready to drop onto any standard AR-15 lower receiver. Let’s dive into whether this upper receiver delivers on its promises.
I’ve been hunting whitetail in the Midwest for over a decade, and in recent years, my home state has opened up to straight-walled cartridges for deer season. I needed a dedicated upper receiver that could deliver accurate, ethical shots out to 200 yards without breaking the bank, and the Rock River Arms Carbine .350 Legend Completed Upper seemed like a great fit.
The upper arrived well-packaged, and my initial impression was positive. The black anodized finish looked clean and durable, and the free-float handguard felt solid. Picking it up, the weight felt balanced and manageable, hinting at good handling characteristics.
Compared to complete rifles chambered in .350 Legend from Savage and Ruger that I’ve handled previously, this upper offered the modularity and familiarity of the AR platform. I chose the Rock River Arms upper receiver over building a custom upper due to Rock River Arms’s reputation for quality control and the value offered in a complete package. My first impression was one of cautious optimism – eager to see how it performed in the field.
Real-World Testing: Putting Rock River Arms Carbine .350 Legend Completed Upper to the Test
First Use Experience
My first range trip with the Rock River Arms Carbine .350 Legend Completed Upper was focused on zeroing and getting a feel for the cartridge in the AR platform. I mounted a 3-9×40 scope and settled in at 100 yards. Initial shots were easy on the shoulder, the recoil being lighter than expected for a .35 caliber round.
The weather was clear and cool, around 50 degrees Fahrenheit with a slight breeze. Functionality was flawless; the upper cycled every round without a hiccup. The only minor issue was the muzzle brake, which directed a noticeable amount of blast and noise back towards the shooter and those nearby.
Extended Use & Reliability
After several months of use, including numerous range sessions and a successful deer season, the Rock River Arms Carbine .350 Legend Completed Upper has proven to be reliable and accurate. The anodized finish has held up well with minimal signs of wear, even after being bumped around in the woods. Cleaning is straightforward, with standard AR-15 cleaning procedures being sufficient.
The upper still cycles reliably with various .350 Legend ammunition, though I found it performed best with 180-grain bullets. Compared to my previous experience with a bolt-action .350 Legend, the AR platform offers faster follow-up shots and easier handling in tight hunting situations. The upper has exceeded my expectations in terms of reliability and accuracy for its price point.
Breaking Down the Features of Rock River Arms Carbine .350 Legend Completed Upper
Specifications
- Caliber: .350 Legend: A straight-walled cartridge legal for deer hunting in many states with restrictive regulations.
- Overall Length: 24 inches: This length is measured from the rear of the receiver to the end of the muzzle device.
- Barrel Length: 16 inches: This is the optimal barrel length for .350 Legend offering balance between velocity and maneuverability.
- Barrel Profile: Carbine: A standard profile that balances weight and rigidity.
- Gas System Length: Carbine Length: A shorter gas system common for 16-inch barrels, known for its reliability.
- Barrel Twist Rate: 1-16: Optimized for stabilizing common .350 Legend bullet weights.
- Threads per Inch: 1/2×36: A less common thread pitch for muzzle devices, limiting aftermarket options.
- Handguard Type: Free-Float: Improves accuracy by preventing the handguard from contacting the barrel.
- Muzzle Device: Brake: Reduces recoil but increases muzzle blast.
- Finish: Anodized: A durable and corrosion-resistant finish.
- Color: Black: A standard and versatile color.
- Gas Block Journal Size-Diameter: .750 inches: A standard size for AR-15 gas blocks.
- Handguard Length: 13 inches: Provides ample space for mounting accessories.
- Gun Rail: Full Top Rail: Allows for easy mounting of optics and other accessories.
- Weight: 4.47 lb: A moderate weight, making it manageable for most shooters.
- Barrel Material: Chrome Moly: A durable and accurate barrel steel.
- Bolt Carrier Group Included: COM-SPEC: A mil-spec compatible bolt carrier group.
- Magazine Included: Yes: A single magazine is included.
- Mount Type: M-LOK: A popular and versatile mounting system for accessories.
These specifications contribute to a reliable and accurate AR-15 upper receiver chambered in .350 Legend. The carbine-length gas system ensures proper cycling, while the free-float handguard and chrome moly barrel enhance accuracy potential.
Performance & Functionality
The Rock River Arms Carbine .350 Legend Completed Upper performs admirably, delivering consistent accuracy and reliable functionality. During testing, I consistently achieved 1.5-2 inch groups at 100 yards with various factory loads. The bolt carrier group cycled smoothly, and I experienced no malfunctions with multiple magazines.
One strength is its accuracy; the 1-16 twist rate seems well-suited for stabilizing common .350 Legend bullet weights. The muzzle brake effectively reduces recoil, allowing for faster follow-up shots. A weakness is the muzzle brake’s excessive blast, which can be unpleasant for the shooter and nearby individuals.
The upper exceeded my expectations for accuracy and reliability in this price range.
Design & Ergonomics
The Rock River Arms Carbine .350 Legend Completed Upper features a standard AR-15 design with a few key enhancements. The build quality is solid, with a well-machined upper receiver and a durable anodized finish. The 4.47-pound weight feels balanced and comfortable to carry in the field.
The M-LOK handguard provides ample space for mounting accessories, and the full-length top rail allows for easy optic installation. The upper is user-friendly, requiring no special tools or modifications for installation on a standard AR-15 lower receiver. There is no noticeable learning curve.
Durability & Maintenance
The Rock River Arms Carbine .350 Legend Completed Upper appears to be built to last. The chrome moly barrel is known for its durability, and the anodized finish provides excellent corrosion resistance. After months of use in various weather conditions, there are no signs of rust or significant wear.
Maintenance is simple and straightforward, requiring only standard AR-15 cleaning procedures. The bolt carrier group is easy to disassemble and clean.
Accessories and Customization Options
The Rock River Arms Carbine .350 Legend Completed Upper comes with a single magazine and a standard AR-15 bolt carrier group. Customization options are plentiful, as the upper is compatible with most AR-15 accessories. Popular upgrades include different muzzle devices (compensators or flash hiders), upgraded triggers, and various optics.
Due to the 1/2×36 thread pitch, muzzle device options are limited, but adapters are available. The M-LOK handguard allows for the attachment of lights, lasers, and other accessories. The upper is compatible with most standard AR-15 lower receivers.
Pros and Cons of Rock River Arms Carbine .350 Legend Completed Upper
Pros
- Excellent accuracy for the price. Delivers consistent 1.5-2 inch groups at 100 yards.
- Reliable cycling with various .350 Legend ammunition. Experienced no malfunctions during testing.
- Durable construction with a chrome moly barrel and anodized finish. Built to withstand harsh conditions.
- Easy to install and maintain. Requires no special tools or modifications.
- Affordable entry into the .350 Legend AR-15 platform. Offers great value for the money.
Cons
- Excessive muzzle blast from the included brake. Can be unpleasant for the shooter and nearby individuals.
- Limited muzzle device options due to the 1/2×36 thread pitch. Requires adapters for some aftermarket devices.
Who Should Buy Rock River Arms Carbine .350 Legend Completed Upper?
This upper is perfect for hunters in states with straight-walled cartridge restrictions seeking an affordable and accurate AR-15 option for deer hunting. It’s also suitable for recreational shooters looking for a versatile, close-to-mid-range caliber for target practice.
Those sensitive to muzzle blast or looking for a wide range of muzzle device options should consider other uppers or be prepared to purchase an adapter. Also, individuals primarily focused on long-range shooting may find the .350 Legend’s ballistic limitations unsuitable.
Must-have accessories include a quality optic (scope or red dot), additional magazines, and potentially a different muzzle device (or adapter) to mitigate the blast.
Conclusion on Rock River Arms Carbine .350 Legend Completed Upper
The Rock River Arms Carbine .350 Legend Completed Upper offers a compelling value proposition for hunters and recreational shooters seeking a reliable and accurate AR-15 chambered in .350 Legend. While the muzzle blast is a drawback, the upper’s overall performance, durability, and affordability make it a worthwhile investment.
At a price of $596.90, this upper is justified, especially considering the inclusion of a bolt carrier group and a magazine. I would personally recommend this upper to anyone looking to enter the .350 Legend AR-15 platform without breaking the bank. Consider this Rock River Arms upper for your next hunt!