You want a .300 Blackout AR upper that runs. Plain and simple. Whether you’re pushing subsonic rounds through a suppressor for hog hunting out west, setting up a compact carbine for home defense, or just enjoying a day at the range, this Brownells BRN-180S is designed to deliver.
What this Upper Does For You
This isn’t your typical AR upper. Brownells took cues from the classic AR-180 platform – known for its reliability – and modernized it. This BRN-180S version is specifically built around the .300 Blackout cartridge and keeps things compact with a 10-inch barrel. This makes for a maneuverable setup, great for tight spaces or anyone who prefers a shorter overall length. It’s built to handle a wide range of .300 Blackout ammunition, including both supersonic and subsonic loads.
Key Features: Reliability and Ease of Use
- Piston Driven System: This system reduces fouling and runs cooler, making it more reliable, especially in harsher conditions, and reducing clean-up time.
- Adjustable Gas System: This upper features an adjustable gas system with two settings. You can fine-tune it to match your ammo and any suppressor you might be using, ensuring the smoothest possible cycling.
- Simplified Handguard: The handguard now locks up with a single, robust screw, keeping everything tight and aligned even during extended shooting. Plus, you can access the gas system adjustments without completely stripping the upper.
- Strong Materials: The receiver and handguard are machined from 7075-T6 aluminum with a hardcoat anodized finish for durability. The 10-inch barrel is made from 4150 steel with a Nitride finish that stands up to wear.
- Versatile Twist Rate: The 1-8 twist rate stabilizes a wide range of bullet weights – everything from light-for-plinking to heavier subsonic rounds.
- AR-180 Style Flash Hider: The included flash hider is a reproduction of the original AR-180 design, and it’s effective at reducing muzzle flash. It also has standard 5/8-24 threads if you want to swap it out for your favorite muzzle device.
Specs at a Glance
- Barrel Length: 10″
- Caliber: .300 AAC Blackout
- Barrel Finish: Matte Black Nitride
- Twist Rate: 1-8″
- Receiver Material: 7075-T6 Aluminum
- Handguard Material: 7075-T6 Aluminum
- Operating System: Short Stroke Piston
- Weight: Approximately 4 lbs
This Brownells BRN-180S upper is a solid choice for anyone building a .300 Blackout AR-15 that they can rely on, whether it’s for hunting, sport shooting, or home protection here in Kansas.
FFL Transfer & Shipping in Kansas
We are a Kansas-based FFL dealer and handle all transfers and shipments in compliance with state and federal laws. If you are purchasing this upper and having it shipped to a Kansas address, we will need a valid copy of your Kansas concealed carry license or other documentation required to verify your eligibility. For shipped orders, please allow for standard processing and shipping times. Local pickup is always available at our Wichita location.
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