BRN-180® Upper Receiver Group Gen2 – Reliable Piston System Made Even More Versatile Designed in conjunction with PWS & FM Products, the Brownells BRN-180® Complete Upper Receiver is inspired by the Armalite® AR-180 of the 1960s. Developed as a successor to the original AR-15, the AR-180 was a civilianized version of the AR-18, itself an upgrade on the M16 platform. The BRN-180® incorporates many of the AR-18/AR-180 improvements - including its robust and reliable gas piston operating system. (Yes, the originators of the AR-15 / M16 eventually embraced a piston!) The BRN-180® Gen2 Upper Receiver Group improves upon the original BRN-180 with two main upgrades. First, all BRN-180® Upper Receivers now ship with an Adjustable Gas System, previously only found on the BRN-180S®. The operating mechanism, the short stroke gas piston concept remains the same, but the user can select between two settings, depending on their conditions and ammunition, to ensure smooth and consistent function. No more spare gas piston cup to worry about. In addition to the new Adjustable Gas System, the Handguard is now retaining with a single locking screw. This large screw provides ample locking force and ensures a more consistent handguard lockup than the previous mechanism. During extended firing, and the barrel heating up, this new locking system ensures the handguard retains alignment and rigidity with the upper receiver. Also, with this new takedown mechanism, the handguard can be removed to access the gas system without removing the internal components. Like the original, the BRN-180® bolt carrier rides smoothly on a PAIR of guide rods. The carrier is buffered at the rear by a built-in polymer buffer with a molded-in steel plate that captures the guide rods. The Nitride bolt replicates the original AR-180 bolt design, right down to its use of a standard AR-15 extractor. Wait - we know what you're dying to ask. Yes, the BRN-180® upper receiver is fully compatible with any standard, mil-spec AR-15 lower receiver. The 16" barrel is machined from extra-strong 4150 carbon steel, with a hard Nitride finish that really resists surface wear. The BRN-180™ is chambered in .223 Wylde - for extra flexibility in ammo choice - with 1-8" rifling, so it handles both .223 Remington and military-type 5.56mm NATO ammo with equal aplomb. Up front there's a replica of the AR-180's unusual three-prong flash hider: the hemispherical bottom prong helps prevent the muzzle blast from kicking up a dust signature when shooting prone. Standard ½-28 tpi muzzle threads let you swap on a modern AR-15 muzzle device should you be bitten by the customizing bug. Ultra-reliable AR-180 piston operating system Compatible with current mil-spec AR-15 lowers Machined 7075 T6 aluminum receiver & handguard - hardcoat anodized finish 16" or barrel with matte black Nitride finish .223 Wylde chamber Button rifled bore; 1-8" twist ½"-28 threaded muzzle Replica 3-prong AR-180 flash suppressor Molded polymer ejection port cover Total weight: 4.65 lbs ALPHA Series Folding Stock Shipped for rifle use, also compatible with Gear Head Works tailhook for arm brace use. Cosmetic arm brace plug sold separately to ensure back beam is smooth. Adjustable polymer cheek piece for comfortable use with all users Adjustable butt pad for increased usability with plate carriers or heavy gear. 5 position locking beam with textured button for quick changing Heavy-duty side-folding mechanism constructed from 4140 heat treated steel Compatible with firearms that include 1913 rail adaptor Full-length locking lug for maximum strength Solid positive lock up in both positions Steel clamp with large surface engagement Can be configured to right - or left-folding Features 3 QD sling attachments Curved, adjustable top surface for a comfortable cheek weld Adds 8.0” to overall firearm length Adds 0.75” to the length of the firearm in the folded position Complete assembly weight: lb 5oz. Constructed of high strength polymer, aluminum, and steel components Made 100% in the USA – lifetime warranty It is the responsibility of the purchaser to ensure that possession and use of this item is in compliance with all relevant federal, state, and municipal laws or statutes. End user is also responsible for any ATF requirements
BRN-180® Upper Receiver Group Gen2 – Versatile and Reliable Performance
The Brownells BRN-180® Complete Upper Receiver is a modern take on the classic Armalite® AR-180, designed for enhanced functionality and reliability.
Key Features:
- Adjustable Gas System: Now included for optimal performance with various ammunition.
- Improved Handguard Retention: A single locking screw ensures stability during extended use.
- Compatible with Standard AR-15 Lowers: Seamlessly integrates with any mil-spec AR-15 lower receiver.
- 16” Barrel: Machined from 4150 carbon steel with a hard Nitride finish for durability.
- .223 Wylde Chamber: Allows for versatility in ammunition selection.
- Replica 3-Prong Flash Suppressor: Reduces dust signature when shooting from prone.
- Ultra-reliable AR-180 Piston System: Proven design for consistent operation.
Specifications:
- Total Weight: 4.65 lbs
- Barrel: 16" with matte black Nitride finish
- Rifling: Button rifled bore; 1-8" twist
- Muzzle Threads: ½"-28
- Ejection Port Cover: Molded polymer
ALPHA Series Folding Stock:
Designed for both rifle use and compatibility with Gear Head Works tailhook for arm brace applications.
- Adjustable Polymer Cheek Piece: For comfortable use across different users.
- Adjustable Butt Pad: Enhances usability with plate carriers or heavy gear.
- Heavy-Duty Side-Folding Mechanism: Constructed from heat-treated 4140 steel for durability.
- 3 QD Sling Attachments: For versatile carrying options.
- Made in the USA: 100% American-made with a lifetime warranty.
It is the responsibility of the purchaser to ensure that possession and use of this item complies with all relevant federal, state, and municipal laws or statutes. The end user is also responsible for any ATF requirements.
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